The probability of pregnancy is related to the menstrual cycle, the time of intercourse, the quality of the male sperm, the development of the female follicle, etc. Moreover, there is no clear clinical specification of the specific probability of pregnancy, which varies from person to person. If a woman’s menstrual cycle is relatively regular and she has intercourse during the safe period, the chances of pregnancy are relatively low, and the chances of pregnancy may be less than 20%. If a woman’s menstrual cycle is irregular, the probability of pregnancy will be lower compared to women who usually have a more regular menstrual cycle. But if you have intercourse during ovulation, and the male sperm quality is relatively good, and the female follicle is mature and ovulates normally, the chances of pregnancy will be higher, even up to 85% or more. If there is a plan to get pregnant, it is best to have intercourse at the time of ovulation. It is best to keep a calm mind, do not be too anxious, and do not be overly nervous emotionally. If there is no plan to get pregnant, it is recommended to take effective contraceptive measures.