Levonorgestrel
"IT WORKS! So without a doubt I had unprotected sex on my ovulation day. Took Plan B within 12 hours. Felt immense nausea at first, then intense cramps followed. My mood was insanely erratic and I underwent quite a bit of depression.  Typical for an increase in hormones. I have not started bleeding yet, as I am 3 days away from menstruation, however, I did take a First Response just now, with a negative response. So I am hoping and believe I should be okay.  I recommend it, if you're not ready. You know you. Decide what's BEST for YOU. People will throw stones living in glass houses. At the end of the day, they don't live with your choice! Thank you Plan B for another option. Thank you Plan B for granting me a CHOICE."