Kind of Niave questions...

Hey so I don't have a super close relationship with my mom to ask her this... so I thought I'd ask here. What kind of doctor do I go to to get a blood pregnancy test? Also when would be a good time to do that? I'm TTC and I'm 11 days late for AF but all my tests have been BFN. I'm not sure what to do from here... thanks in advance! :)