How do you tell?

Amanda
Hello ladies and gents I am wondering how I can tell if it's ppd or just depression or stress?
I had a rough pregnancy was placed on bedrest at 8 months baby born at 37 weeks and is now 3 weeks 4 days so no paycheck from 8 months on to now so savings dried up I am prideful and don't like accepting that I'm in a bad spot I was the only provider for my 4yr old 5 yr old the baby myself and their dad who I found a meth pipe on so he is no longer around I lost my apartment due to I can't pay so lots of stress is it ppd or everyday stress that piled up?