Is Vaginal Estrogen Causing Dark Brown To Black Vaginal Discharge?

I m having dark brown to black vaginal discharge no pain no odor I m detoxing and wantied to know if its because of that I m also taking estrogen vaginally periods are irregular & with these spotting/ discharges I can t tell if theses are my periods or something else kinda goes and come like every 2 to 3 weeks