Breakthrough bleeding and Missed period!!?

I am on Loestrin 24 fe. I never had any problems with it and I loved it because I had really short periods! This month I had breakthrough bleeding starting on sept 8 I believe. It was on and off for about a week and a half which was super annoying. It would just come and go I thought it would be over and the BAM there it was again. I don't remember missing any pills. Now my period should have already started seeing as I'm already threw with my sugar pills and should be starting my new pack .


Anyways what would cause my period to not start?? Is it because I already had a period? Or could I be pregnant?

Answers are greatly appreciated! Thanks  

You could try taking a test. Have you been on any antibiotics recently that would affect your pill? Could be just a funny month.