I've been having unprotected sex with my boyfriend for 3 months now. Usually he pulls out, but for the last few weeks, he hasn't. My period started the day after we had sex last and went on for about 2 days, spotted, then stopped completely. The weird thing is, my flow was extremly heavy until the spotting and, of course, it was shortened by 5 days. I'm wondering if its possible that i could be pregnant?