Hi. My boyfriend and I had sex about 2 weeks ago. We used a condom, he didn't ejaculate, and the condom didn't break (we checked). I'm due for my period soon, and last week I had a heavy brown discharge that lasted 4 days. I feel nauseous and I'm having some lower abdominal pains. I just want to know if I could be pregnant and these are signs, or if these are signs that I'm about to start my period.