Depo shot , chance of getting pregnant

I’ve been on it for almost a year now, my last shot was in the beginning of august and my next shot is October 28.

But I get my period within a month of the shot, like now I’m on my period, but it’ll last the until I get my next shot so I’ll bleed for like 2 months straight fr.

I asked to get my shot early so I won’t have to go through that but they started saying all this extra stuff so I said forget it.

But I wanted to know is the birth control working rn? Is there a chance of me getting pregnant?