emergency contraception
"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."