If you are pregnant and have intercourse that causes bleeding, you need to pay attention to the size of the bleeding, and you also need to observe if there is any stomach pain. If the bleeding stops after resting and there is no stomach pain, you should not be too nervous and you should pay attention to reduce the number of sexual intercourse in the future to avoid the chance of miscarriage or premature birth. However, if there is bleeding after intercourse and there is also stomach pain, then you should promptly take care of the pregnancy. In the early stages of pregnancy, progesterone can be used to protect the fetus, in the middle and late stages of pregnancy can be used according to the week of pregnancy, in the 20th week of pregnancy can be used ritodrine to protect the fetus, after the 24th week can be used magnesium sulfate intramuscular injection or intravenous injection, can also take oral nifedipine, this drug can inhibit uterine contractions, relieve uterine contractions, can play the role of fetal preservation.