Is post partum depression different than normal depression?

Is it called post-partum depression because it’s referring to you and the baby, or is it called that just because you have normal depression after having the baby?

I already have pretty bad depression, I’ve previously tried many different anti-depressants and they always either don’t work, or make it worse. So I weened off them all together and haven’t taken any for a couple years now. I never want to commit suicide, I just have this constant thought in the back of my head that I wish I wasn’t here, but I wouldn’t ever do it myself. I’m just wondering if the depression is going to be different after I have the baby or if it’s going to be my ‘normal’