Biological Principle

When is conception possible?

The menstrual cycle of a woman includes the time from the onset of the menstruation up to the onset of the following one. At middle of the cycle there comes to ovulation – the female ovum reaching its maturity.

That is also the time when mucosa membrane of uterus matures and is ready to receive the fertilized egg.

Biological properties of the ovum suggest that concentration is possible at some define point of time during the cycle coinciding with ovulation.

Taking into consideration that female egg is capable of being fertilized at most 48 hours after ovulation, and that spermatozoa retain their capacity to fertilize eggs even up to four days after ejaculation, FERTILITY PERIOD is estimated to be during 6 days at the middle of the cycle (see the diagram).