Usually 12-28 weeks of pregnancy can be appropriate sexual intercourse, depending on the circumstances of pregnancy. Generally in the 12 weeks of pregnancy need to strictly prohibit sexual intercourse, because the development of the fetus during this period is still unstable, sexual intercourse is prone to cause pre-eclampsia. After 28 weeks of pregnancy, as the weeks of pregnancy increase, the fetus is getting bigger and bigger, pregnant women will become more and more inconvenient, and the uterus is more sensitive to external stimuli, sex is easy to cause uterine contractions, frequent contractions may lead to preterm labor. After 12 weeks of pregnancy to 28 weeks of pregnancy, the fetus is basically stable, so sex is recommended during this period. Sex during pregnancy is recommended to be gentle, and it is best to use a condom, because semen contains prostaglandins, which may induce uterine contractions, causing abdominal pain, which may lead to miscarriage or preterm labor; pay attention to choosing the right position during sex, to avoid pressure on the pregnant woman’s abdomen. Once discomfort occurs during sex, it needs to be terminated immediately.