"first: relax. i know it&#039;s easier said than done but you will be fine. i had sex on november 2 around 1pm and took plan b one step on november 3rd around 4pm - so over the 24 hours. while having sex the condom broke and we continued. i found a $10 off coupon on the plan b website and bought it for $43 the day after having unprotected sex. i used the medication right after buying. i was starting to get really nervous because i knew that my period in the last most was on the 2nd so my period should be coming any time now. a lot of people say plan b made their period come early and few say that it comes later but mine did. i got my period today (november 7th). really bad cramps tho. however, better than 9th months of cramps"