Levonorgestrel
"So, I had unprotected sex about a week ago, and we used the "pullout" method. He didn't ejaculate in me, but I was still nervous, so I went and bought Plan B about 4 hours later and took it. The only side effect I had was being very tied for about the next two days. I was extremely stressed for this past weekend, waiting for my period to come. It finally came today! It is great! Just relax, and don't stress, the pill will work if you give it some time."