Postpartum depression ,

How did u know u had postpartum depression

, my dr says that I have signs of being depressed, I told him I really don’t think I do because I wouldn’t even think about hurt my self or children , but my emotions are all outta wack , BUT I dont think about suicide , just sometimes I think I’m in the way or just take some much to heart (when I used not be like that) I’m not suicidal I’m just extremely Sad and frustrated!