Period Problems.... what could it be?!?

I was particularly sick last month and be on antibiotics I know antibiotics make birth control ineffective.... Keeping that in mind I have a normal time of year that lasted 5 days but since the finishing of my 5 days I have have light bleeding everyday since which have been 16 days presently.... I dont know what it could be from? Any ideas?
Answers:

Bladder infection..?

Could be the antibiotics threw your hormones past its sell-by date, and it may take 1 cycle for the body to go and get back to average. I would actually dance see a doctor since we women are supposed to 1 a year anyway. Age also plays a role as well.

I wear a 36 B bra. is it ok if I still wear a 36 A?

Jus go and get a checkup, it probly is just something to do next to the meds you took and now your term is slowly coming out. check to be sure though

Ladies. What do you do and how to you prepare for a gyno. exam?

Anytime your concerned you should see a doctor, only they will be capable of put your mind at ease.
For the most constituent I wouldn't be overly concerned, nature sometimes plays tricks on the body, especially when you grow elder. If it doesn't get any better surrounded by a few more days , gets worse (or it burns when you shift to the bathroom) or you want answers, see your doctor.