I was diagnosed with bacteria vaginosis 3 months ago and was treated. Std tests show positive for chlamydia so was treated for with Zithromax. About a month later started having mucopurulent discharge and was diagnosed with mucopurulent cervicitis. Was treated with doxycycline and symptom went away. Recently mucopurulent discharge symptom came back and was treated with doxycycline for 7 days again. However, after treatment the symptom still persists. Test for chlamydia and gonorrhea came back negative. Long term monogamous boyfriend tested negative for stds. Why am I still having this yellow discharge? (nothing else, no itching or odor) thank you