"i had unprotected sex a few days before my period and took plan b the same day. i was freaking out from reading all these crazy reviews and stories of it not working. it worked for me i&#039;m over 185 lbs and over the &quot;weight limit&quot; for effeftiveness. 2 days after the pill i had severe cramps and threw up, then the next day more cramps and a very heavy clotted period. then a normal period the next month. personally it worked for me but i took it the same day."