Normally, ovulation occurs regularly, which indicates a good reproductive health of a woman. This regularity for each of us has its own: someone every 25 days, others - every 32 days. Moreover, it can be unstable.
The moment of egg release divides the menstrual cycle into two phases - follicular and lutein. But the duration of each of these phases for all women is different, as, in fact, the duration of the cycle itself. In most women, the menstrual cycle lasts an average of 28-32 days, although more and less lengthy options are possible. Ideally, ovulation occurs in the middle of the menstrual cycle - on day 12-15. But to say exactly when ovulation occurs in one woman or another is impossible. The plotting of the basal temperature chart for at least 4 months in a row allows you to indirectly judge the day of ovulation. But it is rather labile and can move to either side.
Ideally, during the 28-day cycle, ovulation occurs on day 14 from the beginning of the last menstrual period and 14 days before the next, that is exactly in the middle. However, the ideal in nature is infrequent. Experts say that on average, ovulation in different women occurs between 11 and 21 days, starting from the first day of the last menstruation, or between 12 and 16 days before the next.
It should be noted that ovulation can be shifted in time in different cycles. If in the previous cycle the woman's ovulation took place on day 15, then this is not a guarantee of a repeat of the scenario in the next cycle.
The ovulation that comes from month to month is considered a sign of the normal functioning of the female reproductive system and the woman's full ability to conceive children. However, within the norm is also a "break" in the maturation of the egg 2-3 times a year, that is, from the 12th cycle, ovulation can occur, for example, only in nine. If ovulation does not occur systematically, it is a violation of reproductive functions, and a woman who wants to become pregnant will have to seek medical help. The cause of anovulation can be many.
In some cases within the same menstrual cycle, two ovulations occur. This happens on the background of some shocks or stresses, more such double ovulations are affected by women whose sexual life is not regular.
If you want to find out when ovulation occurs, you need to use at least one of the methods for determining ovulation. But as a contraceptive method to use it is not recommended: very low reliability.