In more than 70 days of pregnancy is recommended not to cohabit, in the first three months of pregnancy, are belong to the fetus is not very stable stage, but also the baby’s growth and development of the critical period, there are many pregnant women in the early stages of pregnancy are prone to the symptoms of preeclampsia miscarriage. If you have sex at this stage, it may lead to miscarriage causing bleeding or stomach pain in pregnant women. The vaginal environment of pregnant women has changed during pregnancy, and they are prone to vaginitis. So the first three months of pregnancy, and the late three months of pregnancy are not able to cohabitate, and mid-pregnancy sex should be discretionary to choose.