I had unprotected sex I won't get in birth control cause it was a one night think won't go intro details but had unprotected sex 2 days after my period have ended , 3 hours after unprotected sex I took the emergency pill . Then 5 days later I started bleeding it started brown then bright red then really heavy with clots for 3 days then it stopped but my period is not due till 2 .5 weeks why did I bleed heavy and is it normal ? And what are the chances I could be pregnant ?