Advertisement The only way to figure out why you're bleeding after sex and eventually stop it is to go to your gynecologist and get a pap smear, chat about your contraception, and possibly take some other tests, too. There's a whole bunch of reasons why you might have a little blood on the sheets, and it's usually not a huge deal unless it becomes a regular thing. Bleeding should never last more than a day. The American Congress of Obstetricians and Gynecologists: If bleeding is profuse, as mentioned above, vaginal packing with mild pressure should be applied and immediately see a doctor. This can easily affect you psychologically, having you worried after, or even during lovemaking. Even if you're not using a condom, bleeding can mean you're just not lubricated enough, and you may want to consider a lubricant , she says. If your doctor finds any polyps, she might be able to remove them in the office and send them to a lab for testing, or make a later appointment to have them surgically removed. How can I prevent bleeding after sex? Click here to learn more about the Cervical Cancer Vaccine Abrasions and Injuries Rough sex may also cause tears and lacerations of the vaginal walls. Get your calendar and pay attention to the characteristics of the blood. Another huge reason why you should see a doctor if the bleeding becomes regular: It can be ongoing and totally harmless, or it can happen because of a sexually transmitted infection that you need to get treated, like chlamydia or gonorrhea. This may cause bleeding and pain during sex. In case you are bleeding a lot, do NOT use a tampon to soak it up.