Depression?? Please help!😞

I'm currently 29 weeks+3days pregnant. This past month has been so awful for me. I struggled with depression when I was younger, but now I'm having those feelings again but so much worse. I sleep all the time and no matter how much sleep I get I just feel so exhausted. I have no motivation to do anything, I have to literally force myself to just get in the shower. I never want to leave the house and when I do I dread it so bad. I feel so alone and like I have nobody to turn to, I've been so disconnected with my SO lately.. I feel as if this world would be better off without me in it and I'll never amount to or have anything in my life. I seriously do not feel like myself at all, it's almost like nothing can run me any happiness or joy. I've thought about hurting myself more than a few times, but this baby is the only thing keeping me going and is the only thing I feel like I'll ever do right with myself. But feeling like this can NOT be good for this baby and I'm stuck.. should I talk to my doctor? Do I even have depression? I don't know what to do, I feel stuck. 😞 I just want to disappear. Please help me, what do you all think?