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Calculation of fertility: When does ovulation occur with a cycle of 29 days?

When the ovulatory period begins, the body becomes fully ready to conceive a baby. Therefore, women who want to become pregnant begin to calculate ovulatory days in order to accurately determine the most favorable day for conception. If, with a standard 28-day cycle, the egg cell comes out in its middle, then how are girls with a smaller or larger cycle? If the cycle is 30 days, then when will ovulation, how to make accurate calculations and feel the onset of the day X, if the woman, for example, late ovulation?

Little about ovulation

Ovulation is a definite feminine condition when a mature reproductive cell ready for fertilization comes out of the ovary. In fact, ovulation is a stage of the cycle that follows between the follicle-stimulating and luteinizing phases.

In most women, the maturation and release of the female cell is regular, systematic, repeating every 20-35 days. And follicular and gonadotropic hormonal substances regulate the frequency of ovulatory periods. At the very beginning of the female cycle, the nucleation of a multitude of cells that develops in the follicular structures of the ovary occurs. One of them is far ahead in the development of the rest, acquiring a dominant status.

The duration of development and maturation of the egg is about 11-15 days. By the time of the final maturation of the dominant follicle, its rupture occurs and the cell comes out. All these processes are controlled by the estrogen hormone. But when the cell finally matures, the estrogen drops, and instead, the level of progesterone rises sharply. It is this hormonal jump that causes the follicle to break when ovulation occurs. From now until the end of the cycle, progesterone is responsible for all processes associated with the egg cell.

The ovulatory period lasts about 12-48 hours, which is caused by the individual characteristics of the female body. When ovulation is completed, the next phase of the cycle begins - luteinizing, when conception becomes impossible. There are many ways to calculate the ovulatory phase, some of them are more accurate than the others, but everyone deserves attention.

How to calculate ovulation for a 30-day cycle

When a woman cannot become pregnant for a long time, then she involuntarily begins to calculate the favorable days of the cycle for a successful conception. In other words, the ovulatory day begins to count. Experts recommend counting ovulation using a simple formula. From the date of the expected start of the next menstruation, it is necessary to take 14 days, since the duration of the luteinizing phase normally amounts to exactly 2 weeks.

So, we are interested in when the ovulatory period begins, if the cycle is 30 days. From 30 (cycle duration) subtract 14 (days of the second phase of the cycle). It turns out 16, which means that on the 16th day ovulation should occur at a cycle of 30 days, but some discrepancy of ± 2 days is allowed. It is on this principle that the day the egg cell matures and leaves for other indicators.

If a woman’s cycle time is unstable, then calculating the onset of the ovulatory period in a calendar way will be problematic. In such situations, you can use other methods to calculate the female cell release date, which include ultrasound monitoring, pharmacy strip testing, and basal measurements.

Ultrasound monitoring

This method of determining the ovulatory phase is also called filiculometry. The purpose of this study is to monitor follicular growth and the release of an egg from the ovary.

  • With a 30-day cycle, ultrasound monitoring begins on the 10-11 day of the cycle, i.e. approximately 4-5 days before the middle of the monthly cycle.
  • Subsequent sessions of ultrasound monitoring of the egg are held every two days and last until the release of the egg.
  • The onset of the ovulatory period is confirmed by ultrasound diagnostics, when on the eve of the follicle size was 20-24 mm, and now the growth of the yellowish gland has begun.
  • The procedure can be carried out through the vagina or through the abdominal wall.
  • With intravaginal examination, no prior preparation is required, the main thing is to empty the bladder.
  • For abdominal examination, a traditional examination is performed through the abdominal wall. For it to pass without difficulty, it is necessary to exclude all products that can provoke flatulence or bloating for three days prior to monitoring, and you should not eat and drink at least a liter of water on the day of the inspection.

Ultrasound monitoring requires certain financial costs, but it is the most accurate method for determining the date when ovulation occurs. There are less costly methods for determining the onset of ovulation.

Basal measurements

Proper measurement of basal temperature will help determine whether the patient is normal, early or late ovulation. This is one of the easiest ways to determine favorable days for conception. To use it, it is necessary to measure rectal temperature indicators daily for several months. This should be done after the morning awakening, while you can not get out of bed. Just woke up, and immediately after the thermometer. All results must be carefully noted on a special schedule. At the end of the cycle, all the points with the measurement results are combined into a broken graph. During the monthly measurements are not carried out.

On the days when the graph shows a sharp decrease, and then a rapid increase in temperature, and ovulation occurs. It is better to use simple mercury thermometers for measurements, although electronic ones are quite suitable. The main thing is to make all the measurements with the same thermometer, then the results will be as accurate as possible. With the help of such a schedule a woman will be able to easily determine the fertile days, as well as the nature of egg cell maturation (early or late ovulation), etc.


A simpler way to determine the ovulatory phase is the use of special pharmaceutical strip strips. Such tests are available at any pharmacy points. Since we are interested in ovulation with a cycle of 30 days, then from about 13 days we need to start taking measurements. If ovulation is not observed, then the second strip will be absent. But on the eve or on the 15th day the test line will be as bright as the control one. A similar sign says that the coming ovulatory period is coming, which must be expected in the next 24 hours.

Testing is carried out by analogy with tests for the identification of conception. It is necessary to lower the strip into a container with fresh urine for a few seconds, then put it on a dry surface and after five minutes read the result. If the test strip shows up, and the control strip is missing, then the testing is considered unreliable, since such a test is flawed, it cannot show the correct, true result.

Signs of an egg release

Determine the onset of ovulation, a woman can and on internal sensations, external signs and various changes in the body. The ovulatory period may not always reveal itself by pronounced manifestations, some women will have no symptoms. But experts say that if you listen to your inner feelings, you can feel the time when the egg will leave the ovary.

First signs

The oncoming onset of the ovulatory phase can be guessed by various symptoms.

Regardless of whether late ovulation in a woman or early, its first manifestation is a short-term pain in the abdomen of a pulling nature.

  • Also, the patient notes a slight increase in the number of mucous whites.
  • On the eve of the cell exit, there is a decrease, and then a sharp increase in rectal temperature.
  • If the patient has any ovulatory disorders or pathological failures, then the first signs of ovulation may not be. Such violations can be caused by inflammatory processes in the urogenital system, stress and systemic pathologies, as well as tumor processes.
  • If a girl has reached sexual maturity and reproductive age long ago, and there are no signs of ovulation, then there is a possibility that anovulation takes place. In addition, the absence of any ovulatory signs indicates that the patient is infertile. The main thing is to notice the problem in time and contact a specialist who will select the necessary preparations for the correction of the cycle.

    Symptoms of the onset of the ovulatory period

    As mentioned above, upon the onset of the ovulatory period, changes occur with cervical mucus, which becomes more abundant and liquefies, acquiring the consistency of egg white. It is with such secretions that the body tells the woman that she is ready for conception. With regard to basal temperature, then before the onset of ovulation, they fall, and the next day they rise sharply. It is after this increase and you need to wait for the release of the egg. Those couple of days when there will be a slight increase in temperature, are considered the most fertile, it is then that the chances of conceiving the maximum.

    Before the onset of the ovulatory phase, a serious hormonal alteration occurs associated with an increase in the production of luteinizing hormone. By the way, tests to determine ovulation work on the principles of identifying this hormone, and, more precisely, on its reactions with certain chemicals. Also about the onset of ovulation says some malaise, pain in the abdomen and pulling discomfort in the lumbar region.

    Also, signs such as increased libido, swelling of the mammary glands, sudden mood swings and excessive, chronic fatigue, tearfulness and tearfulness also speak of the onset of the ovulatory phase.

    Early and late ovulation

    Ovulatory periods are late or later than usual, that is, early and late ovulation. If during the 30-day cycle the cell matures for 11-12 days, then such an ovulation is considered early, if it began later than the prescribed period, then the late ovulatory phase is diagnosed. Such shifts can occur against the background of frequent sexual intercourse, exhausting diet, heavy physical exertion, hormonal disorders, diseases, etc.

    At the same time, the probability of conception is preserved depending on how many days ovulation lasts. In fact, this action takes only a few minutes until the cell breaks the follicle and is selected from it. All in fact ovulation happened. But in medicine it is accepted to call the ovulatory period not only the time of the female cell's release, but also the period of its existence.

    If the egg does not come out

    In some cases, during the ovulation cycle does not occur at all, then they talk about anovulation. Even in the most healthy patients, the cells are not able to mature at every cycle; about a couple of cycles remain without ovulation, which is quite normal. Gradually, these cycles are becoming more and more, as the body is aging, and follicular stocks are depleted. By the age of 35, almost every second or third cycle is anovulatory. In addition to physiological reasons, a variety of psycho-emotional experiences, stress, inflammatory diseases of the genital organs and the urinary system, dysfunctional disorders of the activity of intraorganic structures, etc., can provoke such a state.

    So, to calculate the ovulatory period is not at all difficult even on your own. If traditional home techniques such as basal graphs or ovulatory pharmacy tests do not give results, then you need to contact the specialists who, if necessary, will conduct ultrasound monitoring.

    Feels like

    So, sensations are often talking about the imminent release of the egg. Among them are the following:

    1. lower abdominal pain, and from the side where the dominant follicle matures,
    2. there is discomfort inside,
    3. increases sexual desire
    4. taste preferences change
    5. headaches are recorded,
    6. there is stress and apathy,
    7. there is a breakdown
    8. changeable mood, excessive emotionality,
    9. basal temperature rises,
    10. white discharge appears.

    Learn about the onset of ovulation home tests will help that determine the level of LH-hormone. Recall that it is his surge says that the day has come. Tests are carried out using strips that resemble a pregnancy test in appearance. Usually in a pack there are five pieces. They need to do every day, starting with 10 days with a 29-day cycle.

    A positive result is two strips. At the beginning of testing, they may be lighter, but gradually darken.

    The disadvantage of this method is that good tests are not cheap ..

    Basal temperature

    A proven and free method is daily measurement of basal temperature. All this is done in the morning, without getting out of bed, rectally. Doctors advise to constantly keep a thermometer near the bed.

    All indicators are recorded in a separate notebook. On the basis of them the schedule is built. You can talk about the onset of ovulation when the temperature exceeds the level of 37 degrees.

    Important! To make the results more reliable, conclusions must be drawn on the basis of three cycles. One month is hard to say anything.

    Perhaps the most accurate method is a specialized ultrasound. In gynecology, it has received the name folliculometry. The procedure is painless and quick. A vaginal sensor is inserted into a patient lying on a couch, with which the diagnostician assesses the state of the residual space, searches for a dominant follicle, measures its diameter in millimeters. The positive side is also the fact that the doctor can tell in what condition the endometrium is and whether it corresponds to a particular day of the cycle.

    This ultrasound needs to be done over a period of several days. At the last procedure, the doctor will tell you the approximate time of ovulation or, by the presence of a yellow body on the screen, it will say that it has already occurred. The downside of this method is its high cost. In addition, the effectiveness is reduced if the diagnostician does not have sufficient experience.

    Useful video

    We suggest you to get acquainted with an interesting video on the topic:

    Ovulation may not occur in every cycle; a woman of reproductive age can have up to 3 anovulatory cycles per year. To determine the fertile period, you can use simple mathematical calculations, sensations and ultrasound. If the body works without failures, ovulation with a cycle of 29 days, comes on the 15th day.

    Features of the female body

    What is late ovulation? Many women begin to think about this concept with the appearance of failures in the body. This process is certainly associated with something negative, which adversely affect the ability to conceive and endure a healthy child.

    However, is there really a reason for excitement? This is worth figuring out. To do this, it is necessary to determine exactly how it affects the remaining functional processes in the body. Ovulation is the ability of a ready and mature egg cell to the fertilization process to leave the follicle in which it is initially located. This is an absolutely normal phenomenon, which is characteristic of all healthy representatives of the fair sex.

    There is a certain time between ovulations. It usually ranges from 21-30 days. The process itself takes place approximately in the middle of the menstrual cycle. For most women, it lasts for the same period of time, so the ovulation process must also be carried out at the same time.

    When calculating usually take 28 days - the duration of the menstrual cycle in the absence of any deviations. Thus, it is easy to calculate that late ovulation with a cycle of 28 days passes with the onset of 14 days.

    Late periods of ovulation determine if, at the specified duration of the menstrual cycle, the ovulation process is implemented on day 18 and later. Confidently assert that there are some problems in the body of a woman, in such cases it is wrong. To do this, you need to conduct a series of studies and monitor the course of menstrual cycles for more than 3 months.

    It is necessary to pay attention to the fact that in some women the duration of the menstrual cycle may be 34 days. This phenomenon is considered normal if the cycle of the specified time interval is stable and regular.

    In this case, ovulation, which occurred after 18 days from its beginning, is not a deviation, but a normal value, therefore it is not necessary to speak about late terms.

    The time between the ovulation process and the subsequent onset of menstruation should not be shorter than 11 days. If all values ​​are within the framework of the above figures, then talking about the late dates does not make sense. In this case, it is allowed to have small deviations within a few days.

    The reasons for the late appearance

    What are the causes of late ovulation? It is revealed that ovulation occurs in the later stages very rarely. В большинстве случаев существуют причины, которые вызывают рассматриваемое запоздание.Many of the existing negative factors are adjusted by various methods, which favorably affects the functioning of the organism. In this case, the probability of conception is greatly increased.

    The main reasons for the delay of this process include:

    • an infection that is aimed at damaging the reproductive system,
    • hormonal disorders,
    • frequent stressful situations
    • abortion,
    • miscarriage,
    • birth of a child,
    • menopause.

    They are due to both psychological and physiological factors. Therefore, it is necessary to seek help from various specialists for their elimination or correction. In addition, among the causes of late ovulation emit a negative impact from the environment. Pay attention to the presence of frequent fatigue, which greatly weaken the body and disrupt its work.

    Ways to determine the desired period

    The presence of late ovulation can be determined in an independent manner and for this it does not need to go to the hospital. Among the most common methods include the following:

    • observing a change in basal temperature,
    • special test for ovulation,
    • monitoring changes in the body.

    To make sure that ovulation occurs later, you need to measure the basal temperature. For this resort to measure temperature values ​​in the rectum. This method is simple and reliable. This event should be implemented regularly, otherwise it is not able to form a real picture of ovulation.

    Tests can be trusted and in most cases they give truthful answers, but it is impossible to get full confidence. In addition, the test response may be erroneous due to the fact that the woman's body is affected by a certain gynecological ailment. This also includes the action of certain drugs, which include certain active elements. The test must be carried out in a specific time period, which must be correctly calculated.

    When ovulation occurs, most women have specific symptomatic manifestations:

    • general malaise (felt in mild degree),
    • pulling pain that is felt in the lower abdomen,
    • headache,
    • dizziness.

    If you focus on the above symptoms, you can easily determine that ovulation has occurred. However, the symptoms should be pronounced. However, they may be caused by other factors that are completely unrelated to ovulation.

    To obtain accurate data, you need to contact the hospital. They conduct certain studies on the basis of which it is possible to establish the course of the process. Medical examinations include:

    • comprehensive examination by a gynecologist,
    • monitoring event based on ultrasound,
    • analysis of pituitary hormone levels.

    These diagnostic measures will be reliable only if they are implemented within 3-4 cycles. This approach allows the specialist to identify all the signs characteristic of late ovulation. Resorting to medical care is advisable if a woman is planning a pregnancy.

    The need for treatment

    Late ovulation is caused by certain factors with which it is necessary to fight. Therefore, to influence the ovulation itself is simply meaningless. Currently, doctors are resorting to various activities that make it possible to correct the timing of this process. Thanks to them, you can achieve a good result - the process will proceed on time. The main thing is to identify the cause of failures.

    Quite often, miscarriage is a serious problem, due to which ovulation becomes late. In the body, functional changes occur that have a negative impact on the process. However, after 2-3 months, recovery measures will be felt, therefore, it does not make sense to turn to any medication methods.

    However, there are more serious reasons that must be dealt with immediately. These are diseases that are infectious in nature. In this case, doctors offer to undergo a specially designed therapeutic course. Its implementation allows for effective treatment, after which the processes stabilize and acquire normal values ​​for the duration of the course.

    It makes sense to carry out therapeutic measures only when a woman cannot conceive a child and the reason for this is untimely ovulation. Some representatives of the fair sex can be fixed that the signs of the ovulation process are completely absent. In this case, refer to the stimulation process under the supervision of a gynecologist. As a rule, this approach greatly increases the chances of a woman to become pregnant and bear a child.

    Recommended events

    Every woman is able to influence her condition, it’s enough to use some methods that can positively affect the body and normalize the time of ovulation. For this you need to follow all the recommendations given by the attending physician.

    Independently, you can follow simple rules that make it possible to stabilize processes. Stress is considered one of the most frequent factors associated with late ovulation. He must be excluded from his life. Everything should be built in such a way that negative situations have no place in the life of a woman.

    Special attention is paid to nutrition. All products should be helpful. Meals should be complete and regular. Diets adversely affect the health of women in terms of the course of ovulation, so they are strictly forbidden to resort to them.

    Bad habits are another factor that aggravates the situation. Therefore, women who have problems with conceiving a baby must completely abandon cigarettes and alcohol consumption.

    Sport is only a positive effect on the body. However, such an event should be carried out within reasonable limits, after consulting with a specialist. If you can not go to the gym, then you just need to be in constant motion, go to the park for a walk, etc.

    Active sex life is another factor that you need to pay attention to without fail. She must be present in the life of every woman who intends to overcome the late periods of ovulation. The following features must be taken into account: the partner must be the same, and during intercourse there is no need to be protected.

    If all the above recommendations are followed, then the probability of normalization of the course of ovulation is great, and its timing will be correct. If a woman does not make efforts and strives to cope with the problem, then using only medical treatment will not allow to achieve good results. It is very important to overcome the cause that causes the disturbances occurring in the body.

    Late ovulation is not a common phenomenon, but it does occur in some women. At the present stage, there are various ways to deal with the problem under consideration. To use them effectively, it is recommended to seek help from a specialist.

    Women's cycle

    The mechanism of conception is both simple and complex. Nature is designed so that the possibility of pregnancy is given to a woman every month. However, some women with ease use this opportunity, planning even the date of the upcoming delivery. And others, with all their desire, can not get pregnant. What is the matter? Maybe it is worth making a simple calculation and calculating a good day for conceiving?

    Monthly in normal - this is a periodic phenomenon, repeated from month to month, and for good reason the interval between the beginning of the previous and the beginning of the next monthly is called a cycle. It is this cyclicality that allows you to calculate the days when you can get pregnant. And also days are safe when lovemaking without protection does not have undesirable consequences. This calculation builds a natural biological method of contraception. The “classic” women's cycle is 28 days. The duration of 30 days is also an absolute norm.

    Around the seventh day of the cycle, the dominant follicle is determined — it will grow for about a week, and then it will burst, releasing a mature egg. The egg cell will begin its journey through the fallopian tube to the uterus, retaining its vitality for approximately 24 hours. If sexual intercourse happens at this time, and the sperm will be able to penetrate the cervix (express methods of contraception will not be used, the woman will not rush into the shower immediately after ejaculation, etc.), one of the sperm cells that has reached the fallopian tube will fertilize the egg, and conception will occur.

    As a rule, externally, the symptoms of ovulation do not appear, however, some women note a pulling pain in the abdomen, a change in health, engorgement of the mammary glands. All of these signs are called ovulation syndrome. However, you shouldn’t trust them completely and completely.

    How to define "these days"

    Calculate on what day ovulation occurs with a cycle of 28 days (or 30 days) using the methods for determining ovulation. These include:

    • Follicle ultrasound,
    • a blood test to determine the concentration of luteinizing hormone (ovulation hormone),
    • Maintaining a basal temperature chart
    • ovulation test.

    Independently at home, every woman is able to calculate ovulation, daily measuring basal temperature or using a test. Test diagnostics is done repeatedly, starting from about 11-12 day of the cycle. The mechanism of the test is simple: the reagent applied to the strip is sensitive to the luteinizing hormone, which controls the release of the egg.

    On the eve of ovulation, the test shows a clear 2 strips. On average, on the fourteenth day of the cycle, the test will show a positive result - this means you cannot lose precious time: an egg cell lives for about a day - two! And if you miss the opportunity, you will have to wait for a favorable moment for at least another month.

    Keep a schedule of temperature and buy tests - all this requires a certain discipline and financial investments. And you can simply calculate the day of ovulation, knowing the date of the beginning of the last monthly. How to do it?

    Useful Formulas

    The arithmetic of calculating ovulation is simple. If the cycle is 28 days, then we divide 28 in half, remembering that ovulation occurs in the middle of the cycle, and we get the number 14. This means that with a 28-day cycle, ovulation falls on day 14 from the beginning of the last menstrual period. For example, the last monthly came on January 5, which means that in 14 days ovulation will come. It will be January 19 - the most successful day for conception. However, minor disruptions are possible even in the body of healthy women, and the egg can “lag” with the release, come out earlier. Plus, we should not forget that spermatozoa have their own “ideas” about what is considered to be longevity. So, if the egg cell is allotted from 12 to 24 hours, sperm can not die before the week!

    In gynecology textbooks, there is a simple way to calculate how to calculate the monthly fertility time (ability to conceive).
    Beginning: the number of days of the cycle should be divided in two and the average lifespan of sperm should be taken away: 28: 2-4 = 8. Consequently, from the 8th day of the cycle, conception is possible.

    End: divide the number of days of the cycle in two and add the egg's lifetime (1 day) and the possible error of 2 days (if the definition is approximate) - 28: 2 + 1 + 2 = 17. Consequently, the ability to conceive remains until the seventeenth day of the cycle.

    With a 30-day cycle, the calculation is similar. The beginning of the fertile phase falls on day 9 mts, and its end - on day 18.

    Why ovulation is delayed or comes earlier

    Despite the apparent simplicity and accessibility of the calculation of a favorable day for the onset of pregnancy, there may be some nuances. Even with a regular cycle, ovulation can occur not just a day later or the day before — these deviations from the norm can be longer. So, for example, such a concept as early ovulation is widely known - this is the premature maturation of an egg cell. This phenomenon can occur for a number of reasons, including the most common ones:

    • failure in the hormonal system
    • stress,
    • treatment with drugs that affect the hormonal level,
    • sports overload
    • establishment of a cycle after childbirth or abortion, etc.

    When premature ovulation occurs, it is possible to calculate exactly her day at home only by measuring the basal temperature or using a test. As practice shows, early ovulation may occur immediately after the last day of menstruation, and therefore the experienced gynecologist will respond positively to the question whether it is possible to get pregnant on the 6th day of the cycle, noting that with all the low probability this option is also possible.

    And sometimes the situation is reversed when ovulation occurs later than the middle of the cycle - we are talking about late ovulation. Its attack is possible on the 18th and 21st day of the cycle, and even later. There are many reasons for late ovulation, among which highly probable ones are hormonal disruption, stressful situations, sudden weight loss, diseases of the genitourinary system, etc. Keep track of the days of the egg in this case is not easy, help, as usual, the basal method or the use of ovulation tests.

    When to do a pregnancy test

    With a cycle duration of 28 days (or 30 days), when ovulation is clearly defined, and the favorable day for conception is not wasted, you can stock up on pregnancy tests. These little diagnosticians are able to show her offensive with a high degree of probability at home.

    On the 7-10th day after ovulation, the fertilized egg is implanted into the uterine cavity, fixed on its wall, and the production of hCG (human chorionic gonadotropin), a pregnancy hormone, begins. The reagent applied to the pregnancy test strip is sensitive to this hormone.

    The concentration of the hormone, sufficient for recognition of its test, increases to 12-13 days after ovulation. Thus, a good test can show a positive result even a day or two before the delay. The best is the time at least from the first day of the delay. The test is carried out with the morning urine sampling, however, if there is a pregnancy, the concentration of hCG will be sufficient at other times of the day.

    Ovulation is a prerequisite for natural conception. Learning to follow her with a regular cycle of 28 days is not only possible, but necessary for monitoring your own health and planning a long-awaited pregnancy.