Occasional intercourse is not allowed in the first trimester of pregnancy to avoid increasing the chances of miscarriage of the fetus. The first trimester of pregnancy is to avoid intercourse as much as possible. When the pregnancy is relatively short, the connection between the gestational sac and the uterine wall is not close, and the implantation is not stable, sexual intercourse may cause uterine contractions and spasms when the woman climaxes, increasing the chances of fetal miscarriage. You can have sex occasionally after pregnancy according to the situation, but the time to have sex should not be chosen in the early trimester and the late trimester, the early trimester of pregnancy without any abnormalities in the middle of pregnancy can be properly arranged to have sex, the early trimester of pregnancy with a priori miscarriage, the placenta hypoplastic state and so on, it is not recommended to have sex during pregnancy. After pregnancy, you should pay attention to try not to do some things that may increase the chances of miscarriage of the fetus, if there is discomfort in time to consult a doctor.