Missed period on birth control
An_252129 posted:
I have been taking birth control pills for two years now and always had my period at the same time every month when I took the placebo pills. Last month my period was one day later and a bit lighter than normal. This month it did not come at all. I always take the pill around the same time everyday and have never missed one. I am wondering if there may be any particular reason why my period did come this month.
tlkittycat1968 responded:
Nope, no reason. Some women skip a period here and there while on the pill. A regular poster on WebMD had it happen to her three times.

This is assuming you aren't pregnant since pregnancy is still a remote possibility while on the pill.