Having intercourse several times during the first month of pregnancy causes the following clinical effects:1. Frequent intercourse will cause the uterine smooth muscle to contract when reaching orgasm, which reduces local blood circulation and may cause the embryo to stop developing.2. There will be a stripping between the gestational sac and the uterine wall, which may cause vaginal bleeding.3. As frequent sexual intercourse may make the pathogenic bacteria into the vagina, thus leading to the occurrence of intrauterine infection. Therefore, it is recommended that women should not have sex during the first three months of pregnancy, as sex may lead to miscarriage or preeclampsia, or infections, so special attention should be paid. In addition, if a woman has had sexual intercourse during the first three months of pregnancy, and there are no clinical symptoms, it is recommended that she stop having sexual intercourse as soon as possible to avoid adverse effects.