I've had unprotected sex with my boyfriend August 24 and I knew he cumed in me bc we've actually been trying to have a baby. Around august 31 I started to feel pains in my abdomen but I didn't think much about it. I told my boyfriend and he had suggested I take a pregnancy test, so I did. The test came back negative so I waited to take another one and that came back negative also. Around September 6, two days ago today I took the second one. Today September 8, 2017 I start bleeding it's a brownish color but my period is not supposed to start till the 15. So I'm not sure what it can be as of this moment. I've been feeling nauseous and feeling a little tightness in my lower abdomen. Am I pregnant?