How do I talk to someone?

I’m a FTM. Baby is 3 weeks old. A lot of family and my husband have mentioned that I’ve been completely different and very distant. I’ve had thoughts of hurting myself and urges to hurt my baby when she cries (that’s when hubby steps in, I would never actually do it). I know I need to call my doctor, but I don’t know what I’m supposed to say. Do I just say that I think I have PPD? I don’t want to feel this way anymore but I just don’t know what to say. Please help!