It is best not to have sex in the first trimester of pregnancy to avoid increasing the risk of miscarriage. The first three months of pregnancy due to the unstable development of the embryo, and the function of the placenta is not yet stable, we should pay attention to appropriate rest, avoid engaging in heavy physical labor and strenuous exercise, prohibit coitus, so as not to increase the risk of miscarriage due to coitus stimulation. Generally in the third trimester of pregnancy after the placenta has been formed and has a certain function, and the development of the fetus is stable, can be appropriate for sex, but pay attention to the action can not be rough, to avoid the pressure to the pregnant woman’s abdomen, but also pay attention to can not be too frequent. Pregnant women should eat more food rich in protein during pregnancy, such as eggs, pork lean meat, soy products, milk and so on. It is also necessary to properly supplement shrimp, fish, pork liver, oats, walnuts, peanuts and other foods, eat more fresh vegetables and fruits, to ensure that the intake of food nutritionally balanced, to avoid a single nutrient. Pregnant women during pregnancy should pay attention to do a good job of prenatal checkups, actively listen to the advice of professional doctors to do a good job of comprehensive care and health care, pay attention to more rest, at the same time should relax, to avoid tension, anxiety. Pregnant women should also pay attention to the symptoms of abdominal pain and vaginal bleeding after intercourse, and need to go to the hospital in a timely manner.