The last time I had my period was September 2nd and on the next day i had unprotected sex with my boyfriend but he did no completely finish inside me. Now on the 23rd i experienced some bleeding. It was extremely HEAVY and now and it almost completely gone. Did i just get my period early because i have been exercising more than usual or was it implantation bleeding or a very early miscarriage. PLEASE HELP i'm very desperate!