Levonorgestrel
"Okay so it was my never first time using Plan B so I was already afraid. Somehow the condoms we used weren't very good and continuously popped. So here I am freaking out because the only thing I'm thinking about is me being pregnant. So I rush to the store and buy plan b luckily it was in stock. I didn't get any side affects from it I don't think. except some stomach pains here and there but I think it was more axienty than anything. My period came on the expected date. Now it says that women over 165 lbs that take plan b, it won't work. everyone is different and I'm well over 165 and it worked for me."