emergency contraception
"It works. However 30 minutes after I took it, I had very sharp cramps. I started my period 2 weeks later, and it was the worst period ever. It was extremely heavy, long, I had horrible headaches and cramps, and it made my period look like real blood like I had been cut or something.  I wouldn't recommend using it often. That being said, yes it does work but I hope I don't ever have to use it again."