Could I be pregnant ?

I had sex about a week ago and my boyfriend came in me. I’m in the process of switching birth control I was on the depo but I didn’t go get my last shot my period is in 8 days. But is it possible for the depo to be completely out of my system within 1 or 2 weeks?? And I never got my period while on the depo and as soon as I didn’t get my last shot my period came