I had unprotected sex last week monday. my period ended exactly a week before that day. took plan b 22hrs later. now light bleeding?

Learn more...: Plan B (or other similar emergency contraceptive pills containing hormonal medication) can alter the menstrual period bleeding 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.