Should I talk to my OB about worsening depression?

I'm going to let a lot out here so I apologize in advance for the rant/long post but I have no one to talk to and this feels like a safe place to speak freely.

I'm 29 weeks pregnant. Together my bf and I have 5 boys including the current pregnancy with oldest being 9 and youngest is 3, I'm 27 years old with a history of depression and anxiety. This baby was not planned, I'm trying to be happy but I'm so overwhelmed already, I'm trying to get things ready for the baby but all I have so far is a crib, swing, bassinet and changing table. I'm not a new mom so I know what I need and don't need but it's been so hard to get things when I have constant bills to worry about, and 4 other boys who we still need to support. Even with both me and my partner working full time it's a constant struggle to make ends meet. I work a very demanding full time job and I'm in so much pain throughout my shift and at the end of day I desperately want to lower my hours but I can't afford to so I work through it the best I can. I have very little support system, just friends from work that I'm able to vent to but my partner is not supportive at all, we fight a lot and he constantly throws in my face that he wants to leave me, he doesn't respect me or show love for me and is very controlling but financially right now leaving is not an option especially with me being due in late August. I do love him but I know I deserve better. I am not close to my family and live far away from them and I feel so alone. I get so overwhelmed I scream at my dogs for crowding me, I cry Everyday and I'm so overwhelmed with trying to keep my house clean, work and preparing for a baby that I have no idea how I'm going to take care of financially. I feel stressed constantly and I don't know what to do about it. I know it's not good for the baby to be carrying around all this anger and sadness all the time and that just makes me more sad. I don't know what to do I feel hopeless. Everytime I'm alone everything just hits me and I feel like a can't breathe, my sadness takes over me and I just bawl my eyes out and then I feel so exhausted that I can't get anything done. I've considered talking to my Dr about these feelings but I don't know how to open up about these things. I know hormones don't help and probably have a lot to do with my daily ugly crying episodes but I don't know what to do. I'm not ready for this baby. Mentally or physically. And I hate myself more for feeling that way but it's true.

Thank you for reading. If you have any words of advice or kindness I could really use it right now.