Levonorgestrel
"Just want to share my experience. I had unprotected sex twice on "high fertility " ovulation days ( very dumb I know ) took a plan b approx 60 hours after the incident two weeks late I got a very short (two day) period which was odd my period is usally 3-4 .following month I got my period on time & full force . The pill does work ladies and I was ovulating at the time."