i just took plan B today and i read the booklet that came with the box, it says, "The only way of knowing whether Plan B One-Step™ has worked is when you get your next period, which should come at the expected time or within a week of the expected time."
my expected next period is the beginning of next month because my last period was april 3-7
so my period should come regularly? (beginning of next month?)
-jane