Levonorgestrel
"Hey gals! In a 'the heat of the moment' situation, my boyfriend and I ended up having sex on May 25. He pulled out and wasn't in for long since it was both of our first times & we're both in high school, but I was still freaking out. I took the morning after pill less than 12 hours afterwards. Then we ended up having a repeat of this situation May 30. So again, I took the pill. This time it was about 12 hours later though. I waited anxiously, but reading these reviews really helped me. I was sure I was pregnant. My periods irregular, so I wasn't sure when to expect it. I experienced cramps, moodiness, frequent urination, nausea, and fatigues. Now it's June 6th and I just got my period. Don't stress ladies, just let the pill do its job! :)"