I m a little concerned I have not had my period for last month and im about to ne late this month now, and I know for fact Im not pregnant, I m not sexually haven t been for a while now, but my period seem to stop when I started taking clarithromycin and metronidazole and pantoprazole for a Barterial infection called Helicobacter pylori, and on top of those my birth control Lo Loestrin fe. I don t know if I should worry about not having a period for almost two months now, my period was normal before I started on the pantoprazole 2 months ago, before the other two meds where added on the clarithromycin and the metronidazole. Should I be worried about it.