"hey everyone! so i had unprotected sex on nov. 21st took plan b one step 30 minutes after(the sooner the better) i had my period   on nov.12. i was so worried plan b wouldn&#039;t work. i knew i wasn&#039;t ovulating at the moment because i keep track of it. i say if u haven&#039;t ovulated already plan b has a higher chance of working. it&#039;s now dec.7th and i started my period, it came early:) but it worked! and i&#039;m also 200lbs. give it time it&#039;ll work! keep in mind though your hormones is going to be out of whack. where you&#039;ll think your having pregnancy symptoms. i have 3 kids already so imagine how much of a nervous wreck i was during the whole waiting game lol it works give it time!:) hope this helps many of you ease your minds.."