主要是有流产危险的时候,见内

Although most women can safely have sex throughout pregnancy, sometimes it's best to be cautious. Your health care provider may recommend avoiding sex if:

You're at risk of preterm labor
You have unexplained vaginal bleeding
You're leaking amniotic fluid
Your cervix begins to open prematurely (cervical incompetence)
Your placenta partly or completely covers your cervical opening (placenta previa)