Advise?😰

I'm spotting a little bit of brown color yesterday and today, and when I wipe there's a little brown color and then wipe second time and nothing, been doing this right now, I'm on depo shot this is my 8 week on the shot first time and on birth control. 
Can it implantation bleeding or cuz of the shot? can I be pregnant? 
Please answer my question thank u

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