"i realized i had been with my partner on a very fertile day, about 14 days before my period was due.  i panicked and took plan b about 20-24 hours later.  i was able to buy it at rite aid over the counter, which was a relief!  i took the pill and had no side effects until about the time my period was due, and then i got a migraine aura twice in a day.  very scary, but i am prone to migraine auras when my hormones change.  i figured my period was very close, but it didn&#039;t come.  i had no other symptoms except maybe slight nausea.   finally, 6 days later i started spotting and having cramps.  hallelujah!  i&#039;ve never been happier to get my period.  it was 6 days late. so don&#039;t worry - this medication does work."