emergency contraception
"Plan B was taken Sept 15th, 1 hour after our incident when condom broke. I took the one pill and a few hours after started feeling terrible cramps. The cramps only lasted the day I took Plan B and never got them again. 2 weeks later, I got my period. This period was very light, and lasted only 4 days when normally my periods are heavy and last a whole week. I was happy I got my period but was still worried. The next month, Oct, I waited for my period. I didn't come. I missed my second period and at this point was taking pregnancy tests every week. They all were negative. On Nov 11 I got my period. So, it works! Very pleased with Plan B. But you may have a delayed period. So don't freak out. Its a side effect."