There is no clear relationship between pregnancy and how often one should have sex. It is usually necessary to have sex at the time of ovulation, when pregnancy is more likely to occur. The process of pregnancy requires the participation of sperm and egg cells, and egg cells can only be discharged from the ovaries during ovulation, when sex is conducive to promoting the combination of sperm and egg cells, thus promoting pregnancy. Therefore, whether pregnancy occurs or not is not directly related to the frequency of sex, usually 2~3 times a week can be carried out, the most important thing is to have sex during the ovulation period. If a woman experiences delayed menstruation and breast tenderness after having sex during ovulation, she needs to go to the hospital in time for human chorionic gonadotropin measurement to determine whether pregnancy has occurred.