If brown discharge appears after intercourse during pregnancy, the first thing to consider is whether it is caused by miscarriage due to too strenuous movements during intercourse. During this period, you should pay attention to bed rest, observe the amount of bleeding, and watch for stomach pain. If this phenomenon occurs, you should go to the hospital to check the progesterone level if there is a chance of miscarriage. If the progesterone level is low, you should take progesterone orally or by intramuscular progesterone injection for fetal preservation. If it is not a sign of miscarriage, there should be gynecological inflammation, when there is vaginitis, cervicitis, there will be brown discharge after intercourse, this situation needs to do a white belt examination, if it is determined that there is an inflammatory infection, you can take intravaginal drug treatment.