If you have some minor bleeding occasionally after sex, chances are that everything is fine. But the only way to know for sure is to see your doctor for a physical exam. If the bleeding happens right before you get your period or within a few days after it ends and it doesn’t happen again, you can hold off on making that appointment. You can also probably hold off if you recently had a pelvic exam and Pap smear and got a clean bill of health. In all other cases -- or if you’re just worried -- it’s best to get checked out to rule out infection or anything more serious.