After the menstruation and the estrogen produced from the egg begins the layers of the uterus that came down with menstruation rebuild again and continue this construction until the fourteenth day when ovulation and get out of the hormone Bregstron where the building of these layers and begin to release fluids similar to water milk and therefore fed the egg, In the uterus is to receive the procession of the egg if the egg was able to meet the syringe of the sperm that comes from the man through sexual intercourse, that the semantic sensor and the ability of the Almighty God fertilizes the egg and fertilize the fertilized egg and implanted in the wall of the uterus begins pregnancy and ends That is, menstrual blood, but if the egg came to the uterus on the twenty-first day of the first day of menstruation is not fertilized, it does not grow and go through the vagina without feeling the woman and then a few days to five days and six days signs of sadness in the uterus, The classes begin with the menstrual cycle and the menstruation begins for five to seven days, after which the cycle begins again and so on for 45 - 50 years of the woman's age.