"i am a 18 year old girl that made a stupid mistake. my boyfriend and i never have unprotected sex but on november 3rd  we did. i got my period october 28 and i was just finishing up my period the day we had unprotected sex. we ran to get plan b about an hour after that accident. i googled everything about plan b and i saw that apparently there is a 165 pound weight limit and i am really scared cause i&#039;m over that. "