I Was On Depo Vera For 1 Year And I

i was on depo vera for 1 year and i stopped it just last month(november)
i haven't seen my period in this year span nor haven't seen it since i stopped recieving the injections ( every 3 months)
am now seeing a light pink discharge in my vaginal fluid when i wipe after using the toilet. i've only seen this twice so far.
i would like to know what might be the cause of this