"if there is any advice you can take from the internet right now, it&#039;s to calm down ladies!! i promised i&#039;d write a review here to settle nervous tummies on my experience, since i was you at one point. i had unprotected sex on day 5 (yes on my period) of my normal 28 day cycle at approximately 9am. i am grateful plan b was available behind the counter at pharmacy and i purchased it less than an hour after the oopsie. here started the waiting game and bizarre side affects such as nausea and fatigue for almost two months. i was 2 weeks late. also, if this helps, i am 50 pounds passed the weight capacity (165lbs) and it worked!!! :) good luck ladies :) you have nothing to worry about. it works!!"