Prenatal depression & PPD

Should I talk to my doctor about this? Is there something she could do for me? I’m 37+4 weeks pregnant.

I’m going through a split with my baby’s father. Also got cheated on. I’m depressed my 2 year old won’t have his father around because he’d rather drink & do drugs. I’m also scared & sad I have to do this alone… by this I mean having our 2nd baby without him by my side & raising my 2 year old + a newborn alone. ☹️

How would I even go about this? Just be like “oh yeah, I’m depressed!” ?? Idk I’m not really a big talker but I fear I will get PPD as well.. *repost srry*