During the whole pregnancy, only the middle of pregnancy is allowed to have sex appropriately, in the first trimester and the second trimester of pregnancy is forbidden to have intercourse. Pregnant women are in a special period, so they need to pay extra attention in their daily lives. 1. mid-pregnancy can be appropriate sex: mid-pregnancy is the process of rapid growth of the fetus, the development is relatively stable, the chances of miscarriage, fetal arrest will be significantly reduced. At this time can be appropriate to have sex, but must pay attention to the number and frequency of sex, amplitude, as long as the appropriate sex will not have an impact on the fetus and pregnant women. 2. In early pregnancy and late pregnancy three months prohibit coitus: early pregnancy is the rapid growth and development of the fetus and the development of various organs of the key time, coitus in early pregnancy can cause miscarriage and other serious situations; in late pregnancy, although the fetus is basically mature development of various organs, but at this time coitus may stimulate the uterus, resulting in uterine contraction, preterm labor, or even stillbirth, and other serious situations. Pregnant women who experience abnormal vaginal bleeding, abdominal pain, etc., need to go to the hospital immediately for examination, and must be vigilant and pay attention.