I had a one pill dose of azythromyacin for chlamydia and now my cycle is all messed up, what's going on?

Here are some ...: How long has been the messing-up in period? If new, give your body a period of 2-3 months to possibly resume recycling, and do HPT timely soon after missing the regularly expected period (and repeat it in 1-2 weeks if (-) and still in doubt.). If not returning as washed, see you gyn-doc timely for detailing evaluation and care.