Sex is usually not recommended in early pregnancy and can increase the chances of miscarriage. For women in the early stages of pregnancy, because the fertilized egg has just been implanted in the lining of the uterus and is not particularly stable, if you have sex at this time, it may be due to more violent movements, thus increasing the chances of miscarriage. Some women who have intercourse in early pregnancy are likely to induce uterine contractions, which may lead to symptoms of preeclampsia. The first trimester of pregnancy is a critical period of embryonic development, when cells are dividing and the organs are not finalized, so coitus in early pregnancy is not conducive to the progress of pregnancy. Some women may have a weaker body after pregnancy, the phenomenon of poorer resistance, if this time coitus, but also increase the risk of gynecological diseases, is not conducive to their own health as well as the health of the fetus.