I took plan B about 3 hours after a scare had occurred with a condom having a hole in it, and so I went through the things I expected (bleeding about a week later, hormonal changes etc.), and my expected period was about 3 weeks late. Then I got my period and it was normal, lasted about 5 or 6 days. Is that period i just received a sure sign it worked or must I wait for my next period after that to know of it worked or not? Thank you so much for any assistance!