Okay so last month me and my bf had unprotected sex and the morning after I took the MAP. I experienced heavy bleeding a week after I took it and light spotting for a few days after. Since then, we have had sex once but he pulled out before he came.. (Stupid i know) I'm now 3 weeks late for my period, took two home pregancys tests and they came back negative. Is it just the MAP messing with my cycle or could I be pregnant?