I've been on birth control for 3 years and noticed I was having a brown discharge that lasted for 4 days in the middle of my cycle. It seemed to have the consistency of old blood like when a period begins, but it was a decent amount each day (wore a pad every day).
AFTER this bleeding began, I had to take Bactrim for an infection. This bleeding continued while I was still taking both my birth control and the antibiotic. I know that antibiotics can interfere with birth control, but again, this bleeding began BEFORE taking the medicine.
Right now the bleeding/discharge has stopped. My period should be happening in about 10 days.
If it's not pregnancy, what could be happening? I have always taken my pills as directed and never had irregular bleeding.