emergency contraception
"My fiancé and I have only ever used condoms as protection during sex. One afternoon, while we were intimate, the condom broke and neither of us realized it had happened until after the fact. As we are not in a position where we are ready for children, we turned to Plan B. I took a pill within an hour of the condom breaking; and being the nervous and paranoid mess that I was, I took a second at the 24 hour mark. 
As it was the second to last day of my period when we had sex, I wasn't sure how long it would be before I saw a sign that it had worked; but within a week I was bleeding again. After that, my cycle returned to normal.
The only other side effect I experienced was severe fatigue; but that only lasted a week."