about three weeks ago I had my period & about a week or 2 ago I had protected sex but the condom broke & we both did not know. I took plan b that night. Yesterday I experienced heavy bleeding for about 2-3 hours & now I am no longer bleeding. I'm very scared that the plan b did not work due to my weight (146 lbs). & is it normal to bleed almost 2 weeks after the plan b?