So starting in May I was taking lo loestrin fe, but I was not getting my period at all, so I switched to Cryselle at the end of August. I have only been on it for two months, and I don't remember what day I got my period the first month, but I know it was not at the beginning of the placebo pills. My boyfriend and I last week had sex and our condom broke, and I was on the antibiotic azithromycin. I did not miss a pill this month but I did take a few a little later than I should have. We also bought a Plan B pill and I took it about 30 minutes after we had sex. We had sex on the start of my placebo pills and now I only have three left and I still have not gotten my period. Should I be worried, or will it be a week late because I took the plan B pill?