if you are on birth control for 2 and half year and having a brown vaginal discharge since last 3 months, it could be some fungal or anaerobic infection.it has nothing to do with the change of the brand of birth control pill.you should check if your partner is having any infection.consult your gynecologist for possible vaginal swab test and pap smear test to know what this brown discharge is? try flucanozole 150mg weekly for four weeks and a ofloxacin ornidazole combination for 15 days.

Hello, thanks for using HCM.
Brown vaginal discharges are abnormal discharges that more often than not are due to an infection. Genital tract infections are a common issue in females which could be sexually transmitted or not and birth control methods are not known to prevent sexually transmitted diseases but for condoms when effectively used.
Amenorrhoe or absence of menses is a common feature with with hormonal contraception. While some women experience irregular bleeding, others rather experience absence of menses. It is quite comforting that your pregnancy test turns out negative as that supports the fact the absence of menses is due to the contraceptive method. If the birth control method you are using is not hormonal, then you need to be seen by a doctor. However, as concerns the brown discharges, a vaginal smear examination should be done for appropriate diagnosis.
best regards and hope this helps.