Fertility is the natural ability of men and women to reproduce. Women can get pregnant and men are able to father a child like a result of unprotected sexual intercourse during fertile days of woman.
Period between two menstruations (usually in the middle of the cycle) is considered as the most appropriate time for the conception. Then supposedly the mature egg is released by the ovary where it enters the fallopian tube and continues to the womb. As it comes to the conception, the fertilized egg is able to implant to the uterine lining. If no conception occurs, the uterine lining as well as blood will be shed and the unfertilized egg will be expelled during the menstrual bleeding.
Scientists found out that certain tribes living in Africa and Asia have sexual intercourse exclusively during the time when a woman has a menstruation. And these tribes reproduce just as fast as any other people on the Earth.
Dr. Eugen Jonas argued that from the very beginning of his research, namely that the conception can happen at any time during the cycle.
Natural conception control apart the fertile days according to the period, considers another cycle of fertile days, which is based on the biorhythm that Dr. Jonas determines for each woman individually.
According to the results of the 35 years of research (1956 – 1992), 85% of the conceptions occur right during this biorhythm fertile period.
Further improvement of the method was introduction into special calculation and small calculation that offer four basic groups:
Naturally infertile days – contraception (10%)
Gender selection – fertile days for conceiving a baby boy or a baby girl (16%)
Optimal fertile days – for women who cannot become pregnant, although they are healthy and able to have children – primary sterility – and their husbands are also able to have children.
This type of the calculation is the most common (43%). Unfortunately, the infertility has an increasing tendency that is caused by several factors, e.g.: the use of hormones, improper lifestyle, pollution and so on.
The dates of „good vitality“ – for women who have suffered a miscarriage or had an abortion or complications with the fetus or newly-born child, other complications, etc. The second most common type of the calculations (31%).
Here are some factors that increase the risk of the complications e.g.: abortion, undergoing IVF- multiple pregnancies, premature labors, endometriosis, use of hormones, others.