Levonorgestrel
"So I never write reviews but if you're on this page then I'm sure you're scared, as I was. And reading reviews eased my mind, so I'm trying to ease someone else's. The condom broke and we didn't realize until after we had sex, meaning he ejaculated completely inside of me. This happened on day 12 of my 28 day cycle, meaning I was pretty fertile at that point. We rushed to get Plan B and I took the pill an hour later. The only side effect from the pill was That I was nauseous. Thankfully my period came, it was two days early. I'm very glad this pill worked."