emergency contraception
"I am 22 and not on birth control currently for neurological reasons.

A day or two after my period ended (Sunday, Oct 18), I had sex with a condom. The condom broke and we did not notice until we were finished. We went and got the pill and I took it within an hour of the unprotected sex. The next day I was mildly fatigued and had some mild cramping for a few days, but no side effects other than that. Exactly one week later, October 25th, I began bleeding. This is considered withdrawal bleeding from the pill. Exactly four weeks after the withdrawal bleeding begun, I got my period! I suggest taking a pregnancy test any time you worry about it, but know your period can be late from it's normal time because of the pill. IT WORKS!"