A woman in the first three months of pregnancy is best not to have intercourse, because at this time the fetus and placenta is not fully developed, when the intercourse action is too violent or too rough, will easily lead to an increase in the chances of miscarriage. In the middle of pregnancy, you can have intercourse in moderation, but you need to be careful not to move too vigorously during intercourse, and it is best to adopt a lateral position to avoid pressure on the uterus and the fetus, resulting in uterine contractions and increasing the chances of miscarriage. In the second trimester, as the fetus grows and the uterus increases, the pregnant woman’s belly is bulging more seriously, so if you have intercourse, you will easily press on the uterus, and uterine contractions will easily lead to premature birth, so it is best to avoid intercourse in the first and second trimesters of pregnancy.