Calendar method (Ogino-Knausa)

The calendar method (Ogino-Knausa) is a marriage calendar. By using this method, the woman's fertile and infertile days are calculated without the self-observation required by other natural family planning methods. Like all natural methods of contraception it requires that you refrain from intercourse during the woman's fertile days. If it is used as a method of supporting a woman's fertility, intercourse should take place during the fertile days. This method of family planning becomes meaningful after at least 6-12 months of observing a woman's cycles.

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1. How to use the calendar method?

The marriage calendar only requires you to record only the length of your menstrual cycles for 6-12 cycles. Cycle length is the number of days between the first days of your menstrual bleeding. Other symptoms suggestive of a woman's fertility, such as basal body temperature, the amount and consistency of cervical mucus, and cervical symptoms are not taken into account. Fertile and infertile days are calculated based on the time of bleeding.

The assumption that makes it possible to calculate fertile and infertile days is that ovulation occurs 12-16 days before the menstrual period. The egg is fertilized for 12-24 hours after ovulation, and sperm can live in a woman's body for 2-7 days.

2. What to do to count the fertile and infertile days?

  1. First, we choose the longest and shortest cycle that we have observed over the last 6-12 months.
  2. After subtracting 18 days from the shortest cycle, we get the first fertile day.
  3. The days after the onset of menstruation and before the designated first fertile day are infertile.
  4. After subtracting 11 days from the longest cycle, we get the last fertile day.
  5. The days between the last fertile day and your period are infertile.

3. Advantages and disadvantages of the calendar method

This method is relatively easy to apply. It does not require daily observations of mucus, body temperature or cervical symptoms. It is enough to mark the day on which the menstruation appeared in the marriage calendar. Another advantage is the fact that, like all natural methods of family planning, it does not interfere with the health and hormonal balance of a woman.

This natural method of family planning becomes effective relatively late. The absolute minimum before using it as a method of contraception is to observe the ovulatory cycle for six months. It is quite difficult to apply on an ongoing basis, it works retroactively, and there is no guarantee that the calculations will be correct in the current cycle.

Another disadvantage is that it is ineffective in postpartum women. It is also ineffective in women with irregular lifestyle and irregular menstrual cycles (the difference between the shortest and the longest cycle should not be more than 8 days). In addition, the regularity of a woman's menstrual cycle can fluctuate, especially if the woman travels, loses weight, falls ill or is exhausted. The method is not recommended for women with cycles shorter than 25 days. Even with the correct application of this method and a certain regularity of the woman's menstrual cycle, its effectiveness is 20-24 according to the Pearl Index.

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