Postpartum worries

I’ve been through ALOT for my first pregnancy it’s been hell i am blessed with a healthy baby but I’ve litterally been alone the entire pregnancy dad has been MIA since i found out i was pregnant I’m now 34 weeks, Lost my best friend(my grandpa),was really sick in the beginning, My job forced me to take a early maternity leave bc they “couldn’t accommodate my light duty “my doctor ordered for me to have at 8 months pregnant so I’m out of a job until I have the baby and is ready to come back . I had to move back home to my moms who’s mentally unstable and grieving from my grandpa. I’m really really worried when baby gets here I’m gonna fall into depression I’m taking 2 months off and most time I’ll be in the house w the baby due to it being winter and flu season . I’m just wondering are there anyways i can get ahead of the ppd? I would love to do so now.