Levonorgestrel
"Well I had unprotected sex and an hour later I took the plan b pill, I looked at reviews online of women saying they got pregnant even after they took plan b, but they also didn't mention how long after their incident they took it which was probably not soon enough. Plan b worked for me I got my period 2 weeks and a day early and I can't be more happy. I do recommend taking plan b the day of the incident or even the day after but I felt better by taking it the day of! The best way is to not have unprotected sex stops you from wondering and worrying! Hope I was helpful!"