In the first and second trimester of pregnancy, sex will have a greater impact on the fetus, the first trimester of pregnancy when the placenta in the gradual formation of the body’s progesterone content is relatively small, the fetal organs are differentiating and developing, at this time if the sex life is very easy to cause miscarriage, and at this time you should try to avoid caressing and other actions, otherwise it may cause pregnant women to contractions, the severe cases can cause miscarriage, and in the second trimester of pregnancy Sex, because there will be contractions may cause premature birth, and the second trimester of pregnancy because the fetus is relatively large will easily be pressed to the abdomen. In the middle of pregnancy can be moderate sexual life, at this time the fetus has been more stable and the placenta has been formed, is not easy to miscarriage, but in the sexual life should pay attention to the action should not be too violent, and do not press the pregnant woman’s abdomen, it is best to use a condom.