Starting to get alarmed a bit. My SO & I had unprotected sex 2 weeks ago, and again a week ago today. I was on what I thought was my period, was very light, and lasted a few days. Since I got off my "period" a week ago, I stopped bleeding for 3 days or so, and now I have had constant brown spotting only when I wipe.. and it's not going away. This never happens to me. I'm not on any birth control, so I know it can't be that. Could it be implantation bleeding? I am so lost.