Sexual arousal in early pregnancy may cause contractions, which can easily lead to preterm miscarriage, and coitus is not recommended in early pregnancy. In addition, pregnant women with a history of habitual abortion should be prohibited from having sex during pregnancy. Early pregnancy placenta and uterine lining is still not stable, if in early pregnancy sexual excitement easily cause uterine contractions, may lead to pregnant women vaginal bleeding, abdominal pain and other manifestations of the first sign of miscarriage. Therefore, pregnant women should avoid sexual relations in early pregnancy to prevent the occurrence of preeclampsia. If a pregnant woman has ever had a habitual abortion, no matter whether it is early in pregnancy, or in the middle and late stages of pregnancy can not cohabit, to prevent cohabit sex excitement induced by the first trimester abortion. Sexual arousal during coitus in early pregnancy may trigger uterine contractions, which may increase the chances of miscarriage with preeclampsia. It is recommended that pregnant women avoid sexual relations in early pregnancy, and that they get enough rest and avoid overwork and strenuous exercise. In addition, pregnant women should take folic acid supplements as prescribed by their doctors and go to the hospital for regular checkups.