I finished my chlamedyia medication and it's time for my menstrual cycle to start, but i have brown discharge. is this normal?

It may be: Apparently you are being treated for Chlamydia which is a treatable STD and just finished your course of Antibiotics and has brown discharege and it may be that your infectionis not yet under control Follow up with your Gynecologist or the treating Physician if the infection has cleared Most of the time there is co existing Gonococcal infection and may need to be ruled out as well if not done