Third trimester depression...

I will begin my third trimester on Sunday and I have been really depressed since Monday. They job that I was working has lowered my pay $2 and shortened my days & hours because they feel like I need to slow down when I an perfectly fine. So that means I will be basically using change to pay my bills because I won't be making as much. Another reason for my depression is I don't feel like I'm prepared enough to bring my son into this world when I'm about to be barely able to pay my bills so I can't save to make sure he has everything and that I will still be able to afford my bills while on leave. His dad has already said that he will help me with the baby but I still feel like I have a heavy load of financial issues. I'm really trying to keep my head up but it's now getting so hard because I'm just 2-3 short months I will be having my son and I don't want to struggle. I spent my whole first trimester depressed and angry. My second trimester I was always really happy and ambitious. However now I'm just not ... Is this normal?