Pregnant while 8 weeks pp??

I got the depo shot at 6 weeks pp and that same day I had unprotected sex, however my husband did pull out. I wasn’t told by my dr that I had to wait 7 days for the birth control to start working. Now I’m worried that I may be pregnant and that’s the last thing I want. 8 days later we had sex again but this time he didn’t pull out, I was protected by the depo that time right?

How soon can I take a pregnancy test ? Has anyone on here gotten pregnant like this before ?