weird discharge

im on the pill and have been on the pill for almost a year. i take my pills at the same time every day. i haven’t missed a pill and last week i got some light pink discharge but didnt think anything of it. today is the sunday i start my placebo pills and i got pink discharge on top of brown discharge. i don’t usually get my

period until the tuesday or wednesday after i start my sugar pills. could this mean i’m pregnant? i haven’t had any other “symptoms” except i’m pooping green for the past week. could by pills not be working?