emergency contraception
"I took plan B 40-42 hours after unprotected sex which was also 5 days before my next period was due. Although this is my third time taking plan b (I know, I'm getting BC next week!) I was just as nervous as the first time. I know it can really mess with your period, and I knew I was stress if it caused mine to come late. However I got my period on the exact date it was due. The down side it that I have had HORRIBLE cramps. And a lot of (what I call) clots. 
Before it came I also had really really  bad nausea for two days which is normal for me right before my period. I usually experience breast soreness too but I had none of that this month (not complaining) 
Also the last 2times I took it I was 192. I'm 159 now, it works the same!"