Is this my period?

Katie
I was 40 days late for my period, I got a positive pregnancy test and made an appointment for my first oltrasound. Two days ago I started having brown discharge. Now it's progressed to light pink blood with a little bit of dark red blood. (Gross I know)
Is this my period? It's just really light, and I'm confused. I probably bleed a pads worth in 3 days. 
And like I said there is some dark red blood but it's mostly this brown discharge and my periods have never looked like this.