"i had unprotected sex on october 27 and took the pill 12 hours after because i realized i missed a pill the day before i had sex. i had knee pains right after taking it. i heard that if you are over 175 that the pill may not work (im about 240). 6 days after taking the pill i started having back pains and cramps on that day i also had a situation that made me emotional. luckily my period came on as scheduled."