who should I contact if I think I'm having postpartum depression? my regular doctor or someone else?

Your regular doctor. They told me if I thought I had it to come in immediately.

the only issue is that I've never had a doctor I see regularly but I guess I can just try to find one near me. thank you @their.bomb.ass.mom

Talk to your obgyn then, they told me the same thing when I was discharged after I gave birth.