Plan B
"I'd be lying if I said this was the first time I've taken Plan B due to a sexy time slip up.  In fact, it's the third. The first was 10 years ago (when it wasn't OTC and 2 pills). The most recent was Dec 18th, which, by the the was ovulation day, I didn't realize until after the fact. I took Plan B maybe two hours afterwards.  Over the weekend I was super fatigued and crampy as well.  The following week I felt fine.  My period was to come on New Years Eve, that Monday the cramps started back up on Tuesday I was spotting.  On NYE my period started and ended on the 4th.  Today, I noticed a little bit of spotting, but I've had that happen before with Plan B. So, not preggers and SO is finally calling about a vasectomy."