HELPPPP!

First off, I'm going to call my doctor first thing on Monday. They have been closed and my MIL has been out of town and both my parents and SO work, so hospital is out of the question. My period ended about 10 days ago or so +/- a few days. My SO and I had sex on peak day. We had a quickie right before work. Well, ever since then I have been bleeding, almost like a full on period but mine just ended. Anyone ever had this happen to them? I need some insight or something. I have a little cramping like my period. I do not have endometriosis or pcos.