"i had sex with my boyfriend a couple of weeks before i was predicted to start my period. after intercourse, we discovered that the condom had broken. within an hour after, we went to the store and bought the plan b pill. it was expensive, over $50 for just one pill. i experienced diarrhea, headaches, some spotting, and extreme mood swings. of course when i started spotting before i started my period, i was freaking out because i thought that i was pregnant. but i found that spotting is one of the side effects. the day before my projected period start day, i started my period! i know it is close to impossible to not worry about this, but don&#039;t worry! i was doubtful that it worked, but it does! sooner you take it, the better."