Postpartum depression issues

Is it normal to want to blame your OB for you delivering before 40 Weeks? I delivered at 38.6 Weeks a healthy 6lb 13oz baby but my PP depression is so bad. I love my OB. He was very helpful and very nice this whole pregnancy. I know he knew what he was doing and my body was obviously ready. But my EDD was 3/12 and I’ve been so torn up about not having my baby inside me. Are these feelings normal? I wouldn’t say I hate him, but I’m very much unhappy with delivering early :/