My boyfriend and I had sex unprotected 21 days after my period started, so this means my period was regular and 8 days later we had sex. We were both scared so it was short less than 30 seconds. Before we had sex I always had to go to the bathroom, my stomach hurt, and I ate a lot. That was before, and now I feel like either its all in my head or it really is me being pregnant. Could I be?