Levonorgestrel
"I just got off "the pill" after being on it for the last 2.5 years because I thought it was causing me to have bad breakouts/acne so me and my bf had unprotected sex one night/morning (no birth control and extra fertile since I had recently stopped taking the pill and not to mention the "my days" app that I use said that I was at my peak fertility day the same day) so panicking, I purchased the generic plan b pill (aftera, about $43) less than 24 hours later and took it. I do remember some cramping. (I took it about 3 weeks ago) After reading the reviews I started to really panic because my period was due 2 days ago and I read that a lot of people got their period sooner than expected but it finally came 2 days late so I guess it works!"