I got my menstruation on july 17 and ended on 21 july. i had unprotected sex on 25 july. i got my menstruation on august 10 again and i had unprotected sex on 11 august and drank postinor 2 tablet to contol pregnancy.i normaly got my menstruation cycle around 28 days and have menstruation bleed for 5 days And also i got a bottom abdominal light pain after taking that tablet and still menstruation bleed as same as before days at day time but not at night. and sometimes bleed at night also ... how to stop bleeding what is the problem.