You can’t have intercourse in the first 3 months of pregnancy. The fetus is in an unstable stage, and if you over exert yourself at this time, stimulation of the cervix and the vaginal wall will cause bleeding, which can lead to the occurrence of pre-eclampsia and miscarriage. The coitus will also cause the endometrium to be excited, which will cause bleeding to occur, and will also cause preeclampsia and miscarriage, so be sure to pay attention to the first 3 months can not have coitus. You can have intercourse after the third month of pregnancy, and you must be gentle to avoid bleeding as well. You can’t have intercourse after 32 weeks of pregnancy because it’s close to the due date, and if you have excessive intercourse it will compress the abdomen and cause premature labor to occur, which will also have an adverse effect on the fetus.