Chances of being pregnant on Depo?

So I've been on the Depo shot for about 2 months now, I got my shot on July 21 but I'm gonna be getting my 2nd one on October 9. However, on August 22, my boyfriend came inside of me for the first time & I think I started my period on Sept. 1 but I haven't stopped bleeding til this day, it's not too light nor heavy, it's enough where a linear will cover me. Is there a chance of me possibly being pregnant even if I'm bleeding this much?