Levonorgestrel
"The pill worked!!!  For those who are worried right now and desperately searching the internet for any form of relief...I promise you that things are going to be okay. I took the pill 3 hours after having unprotected sex (condom broke) and even though we had sex right after my last period I was still so scared I could end up pregnant. I am a freshman in college and I'm no where near ready to have a baby. My advice to whoever is reading this right now is to try your best not to worry, the pill will work it's magic and you will be okay. Also stress can delay your period even more (mine came almost 2 weeks late) so try to keep yourself busy!and  Make sure next time you have the right protection!"