Levonorgestrel
"Okay, So if your on here freaking out like I was.... stop. Seriously! Okay so me and my boyfriend had unprotected sex while I was fertile, he did pull out but pre cum is just as effective. So I freaked out, and bought plan b one step and took it 21 hours later. I felt nothing. No spotting, just my boobs were sore and I was tired and moody. I was expected to ovulate around that time too so that just made it worse, since it's less effective if you take it after ovulation. So soon enough I got my period the day before I was supposed to get it! My cramps are worse than usual, but it's better than being 18 and pregnant. Learn from this experience! But chances are your fine, so relax and go order some dominos cause plan b will do its job"