Twice. Both times were the day after having sex (the condom broke). Everything went fine that month in regards to my period...the only thing was that I got it a week early, but the bleeding was normal, as well as the duration. However, this month I've been very careful with being protected during sex but my period is over a week late. Last month I got it on June 8th. I was thinking, though, that that could have been an effect from the Plan B pills (getting it a week early)...so now I'm wondering whether I should be expecting my period at the same time this month (July 8th) or if I should be expecting it at the date I usually get it (before I took plan B...16th/17th). Any help will be greatly appreciated!