"i took plan b like 2 years ago and about a week after taking the pill i got my period. i have to emphasis that i took the pill within 3 hours of having unprotected sex. however in october 2013 we had unprotected sex and waited 48 hrs to take the pill.  i never got my period and i ended up getting pregnant even though i took the pill.  like i said this pill works but the sooner you take the more likely it will work."