Pregnant women are generally allowed to have intercourse, but they need to be careful to avoid the early and late stages of pregnancy. Women in the first three months of pregnancy, due to the embryo is not stable, or under the influence of factors such as coitus or stimulation, it is very easy to miscarry. Therefore, pregnant women should not have sex during the first 3 months of pregnancy. In addition, women are not recommended to have sex about 3 months before the delivery, when violent sex may stimulate the uterus to trigger contractions, premature labor, premature rupture of membranes and other phenomena. In addition to early pregnancy and late pregnancy about 3 months each time, in the middle of pregnancy, due to the fetus is relatively stable, it is appropriate to have sex. But also need to pay attention to the number of times, avoid too frequent. If pregnant women have sex during pregnancy after physical discomfort, need to consult a doctor in time.