i had a miscarriage on june 24, i had light bleeding after and then i started to pass blood clots and a little heavier bleeding. about 6 weeks later i had unprotected sex and i took plan b on a saturday a few hours after intercourse. i started spotting very light on wednesday, and thursday i began to bleed heavier. now i have to change my pad about every 40 minutes to an hour. could this just be because of the pill or can it be cause by something else?