I had unprotected sex with someone that did ejaculate inside of me, just messy on his end. I took the Plan B Pill the following evening. My period was supposed to come the following day after I took the pill but it did not. Exactly one week after I took the pill, I started what I thought was period with slight cramps. I bleed for one day and then the blood stopped completely by the following morning. This has never happened. I have no idea what this means and I feel fine.