So I took plan b just under 70 hrs after a mishap. I had a light period the following month, but have yet to have another. I'm assuming that the pill has thrown me off. Anyone had these problems before? Here's a summary of what happened

July 31- mishap
Aug 2- plan b
Aug 16- period came a few days late
Sept 23rd- still no period
Haven't had sex since the mishap so pregnancy is pretty much out.