I had unprotected sex the day my period was ending i am on a combination birthcontrol however i was scared because i did not take it at my time so i took plan b 2 hours after 9 days later i began bleeding as if i was on my period. it was much more than i

Learn more...: Plan B can alter the menstrual period for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex because Plan B works most of the time, but not all the time. Learn more about your birth control pill from your doctor. With a COMBINATION pill, one can stray from her "pill taking time" several hours and be fine.