"i took plan b 40-42 hours after unprotected sex which was also 5 days before my next period was due. although this is my third time taking plan b (i know, i&#039;m getting bc next week!) i was just as nervous as the first time. i know it can really mess with your period, and i knew i was stress if it caused mine to come late. however i got my period on the exact date it was due. the down side it that i have had horrible cramps. and a lot of (what i call) clots. 
before it came i also had really really  bad nausea for two days which is normal for me right before my period. i usually experience breast soreness too but i had none of that this month (not complaining) 
also the last 2times i took it i was 192. i&#039;m 159 now, it works the same!"