Intercourse on the day of clean menstruation may result in pregnancy, but the probability of pregnancy is low, so couples who do not want to have children should take effective contraceptive measures. On the day of menstruation, there is usually no ovulation and it is a safe period, but some women may experience abnormal ovulation, and intercourse can lead to pregnancy, but the probability of this happening is low. Although the probability of pregnancy is low, couples who do not want to have children should also take effective contraceptive measures, you can use condoms, and if you want to use long-term contraception, you can place a birth control device in the uterus to achieve long-term contraception to avoid unwanted pregnancy. Before and after coitus, pay attention to physical hygiene, change underwear to avoid infection.