"a friend and i had a mishap with a condom : i checked ovulation calendars (even though they aren&#039;t reliable information)they indicated i was in the fw..past ovulation. maybe. we bought plan b, and i took it 8pm the day after.  all the symptoms began the following day. nausea,  with waves of panic after reading it might not be effective on women over bmi, which i found news those studies are not conclusive. no proof.  more freaking out because of timing. i may of already ovulated. well, my period was on time but did not have usual symptoms. i had pregnancy symptoms as  pms and  plan b like to mimic. he flaked out prior to so i&#039;m glad. im 38, bmi is high, i already ovulated am sure and time frame was 24hrs later after deed.  it worked for me."