"i had a condom break on june 30 and quickly took plan b within 2 hours of the accident. i was freaking out because i read that it doesn&#039;t work after ovulation and my last period was on june 10 and i am pretty sure i had already ovulated. on july 9 i took a pregnancy test because my period was a couple days late and it was negative and finally today july 11 i got my period this morning. so yes this does work even post ovulation. some side effects i had were nausea, period like cramping, lots of white discharge, sore breasts,delayed period and fatigue. and now heavy heavy heavy period. worth the side effects though."