There is a possibility of miscarriage if you have intercourse in the early stages of pregnancy. During the first 3 months of early pregnancy, the fetus is very unstable and intercourse is not allowed during this time. Strenuous exercise, mood swings, and having sex during this period may lead to miscarriage. You should not have intercourse during the first 3 months of pregnancy and the second 3 months of pregnancy to avoid any effect on the fetus. When having intercourse in the middle of pregnancy, it is also important to pay attention to the position of coitus and the number of times should not be too many. In addition, for pregnant women with placenta praevia, placenta previa, etc., it is best not to have intercourse during the entire pregnancy, so as not to cause preeclampsia, premature labor, and so on. Early pregnancy should pay attention to rest, increase nutrition. When discomfort occurs, go to the obstetrics and gynecology department of the hospital in time.