thanks a lot for answering.no i m not ttc yet.
Since you said you get a period once in a 2 months sometimes, that could be what is going on now. You may not get it until sometime this month. I would wait another 2 weeks and if you have not gotten your period, I would try testing again. Are you TTC? You could always ask your doc to check you out as well if you don't get your period soon. As for the antibiotic, I am not sure if that could delay your period, hopefully someone else may know. Hope that helps you somewhat!! =)