Hi Im A Sexually Active 19yr Old With Only One

Hi im a sexually active 19yr old with only one partner im currently on birth control pills. Sometimes i experience white discharge with. No odor my doctor.said it was due to using summers eve cleansing wash. Yesterday i noticed a brown discharge only like a small ball of dischargd i noticed this three times twice yesterday and once today. The discharge i saw today was accompanied by the white discharge. Can you explain this? Could i be pregnant?