Sometimes I bleed after sex, why?

[Triplikeido]

Ok, my boyfriend is very well endowed. He's about 9 or 10 inches long and at least 3 inches around. I am a very small girl. We've been having sex for 2 months now, and until recently everything has been fantastic. However, this past week, after every time we have sex, I bleed for 3-5 minutes. Also I have mild pain behind my belly button and slightly to the left. I've never in my life been with some one near his size, I just recently started birth control and I just finished my first month of pills. I don't feel this is an std because he had not been with anyone for nearly a year before me, and I hadn't had a partner other than him for a while as well. Any advice would help greatly.

[Ookami11]

If nothing is seriously wrong try switching positions so you don't take so much of him inside you. Try side by side with him behind you. Or maybe with you laying on your stomach and him on top of your back.

[Pepper Schwartz, Ph.D.]

You should go see a doctor whenever there is sustained bleeding of any sort. Sure, it could be tears in the sidewalls of the vaginal or by banging against the cervix ( solved, by the way by using an artificial lubricant and taking it a bit easier) but it could also be something else ( like break through bleeding because of the change in hormones caused by birth control pills) But it could also be something else- and you won;t know whats going on unless YOU SEE A MEDICAL DOCTOR IN PERSON.

So, go. A quick check up will probably clear the mystery up and that's worth a lot right there. But you cannot get a good medical diagnosis unless you go see a gynecologist or internist.