Is it PPD or regular depression??

Before pregnancy I suffered from major depression because I have a bipolar. So now I am postpartum and post pregnancy I have gone in an out of depressive episodes like I usually would prior to pregnancy. So I don’t think that would be considered PPD I think that’s just my regular depressive self prior to pregnancy that just happens to be after I am pregnant so I find it annoying when people say I have PPD when it’s just the depression I’ve always had.