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How to calculate the non-fertile days of the woman


Just as we can learn to calculate the four most fertile days to successfully achieve pregnancy, we can also use knowledge of the menstrual cycle to calculate the non-fertile days of a woman, which are those days when the chances of pregnancy are very low.

We explain how to calculate non-fertile days of women. In this way you will be able to know which are the days with the least chances of pregnancy.

Many women, once they have decided that they do not want a pregnancy, prefer not to use contraception and they bet on the observation of the menstrual cycle to locate your non-fertile days. It is not the most effective method, of course, since menstrual cycles are not always the same. One month can be 28 days and the following month, less ... or more.

But yes, just as there are four days of maximum fertility within the menstrual cycle, there are also less fertile days. During these days, pregnancy is less likely, although never impossible. To calculate what these days are, you must take into account the division of the menstrual cycle into three stages:

  1. Follicular phase. It is the first phase of the menstrual cycle, the moment in which the ovum, if it has not been fertilized, descends and reaches the exterior as menstruation. This is the stage of the menstrual cycle in which the least chances of pregnancy exist. It lasts about a week, since the period begins. The days following the period, prior to ovulation, there are chances of pregnancy, albeit slight, since sperm are capable of surviving in the woman's body for five days.
  2. Ovulation stage. It is estimated that between days 12-16 ovulation occurs, which is the moment in which the ovum is expelled from one of the ovaries into the fallopian tube, where it will wait for the arrival of the sperm to be fertilized. These four days are the days of maximum fertility of the woman, and those that you should avoid if you do not want a pregnancy.
  3. Luteal phase. If the ovum was not fertilized, it will begin its descent to start a new period of menstruation. You should avoid the five days after ovulation, because pregnancy can still occur. That is, avoid also the days between the 16 and 21 of your menstrual cycle. The rest of the days, until the period begins, are days of low fertility.

If your cycle is quite regular and it is also 28 days, you can calculate quite easily which are the non-fertile days and which you should avoid if you are trying to avoid pregnancy. However, always remember that, although your cycles are usually regular and stable, there can always be some 'disorder' without prior notice. In a 28-day cycle, these would be the days of least fertility and those of maximum fertility:

  • Between day 1 and 7 of the cycle (beginning of the period): Very little fertile days.
  • Between day 8 and 11 of the cycle: Few days fertile but not safe. Yes, pregnancy can occur.
  • Between day 12 and 16 of the cycle: Days of maximum fertility.
  • Between days 17 and 21 of the cycle: Few days fertile but not safe. Yes, pregnancy can occur.
  • Between days 22 and 28 of the cycle: Few days fertile.

In summary: the non-fertile days of a woman with a menstrual cycle of 28 days are those that go from day 22 of the cycle to day 8 of the next cycle. In total it is about 14 days.

You can read more articles similar to How to calculate the non-fertile days of the woman, in the category of On-site fertility problems.


Video: When Does A Woman Ovulate? How To Find Out Ovulation Date. Fertility Tip By Dr. Seema Sharma. (January 2022).