You should not have intercourse during the first and second trimesters of pregnancy. Because the gestational sac is not very stable in the first trimester, if you have intercourse, it may cause a preterm miscarriage or the embryo may stop developing. In the second trimester, as the abdomen of the pregnant woman is bigger, if you have intercourse at this time, it may compress the abdomen of the pregnant woman and cause premature rupture of the fetal membranes, and it may also cause infection and fetal amnionitis, which may lead to premature birth of the fetus, which will have a great impact on both the pregnant woman and the fetus. In the 3-7 months of pregnancy, you can have sex, but when you have sex you must be careful, gentle movements, and not too frequent to avoid the impact on the pregnant woman and the fetus.