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.