Hi I started triple therapy for h pylori last Tuesday evening. Amxocilian and clarithromycin are my two antibiotics, two x's daily for 10 days. I was scheduled to start my period yesterday (Sunday)5 days after taking the antibiotic pills and have not be late for over two years of taking the pill. I am taking Ortho tri cyclen. I also came down with a cold yesterday. Is it normal to be late?