Am I in the wrong?

Relationship post, but it's about pregnancy so I'm posting here. My husband just got really upset with me because I told him that I was worried that he's taking the soon to be arrival of our child too relaxed. He keeps saying how easy it's going to be & how he doesn't need to read about taking care of a newborn. Don't get me wrong I know he's going to be an amazing dad, this baby was wanted and planned for for MANY years & that being relaxed and go with the flow is just how my husband is. So I calmly stated my fear that it'll be a huge reality check when he realizes how hard it will be, especially at first. And he blew up on me basically saying I was implying that he's going to resent his child?! We never fight-& he got so mad at me he told me to just stop talking. Now I'm upstairs crying and trying to figure out if I was wrong in saying that? Can you ladies give me some input please? I thought I was being calm and just talking with him but I guess I hit a nerve....And if I'm in the wrong please tell me! Lol...we are a mature 27 year old couple who have been married for 7 years. I'm just a little hormonal and baffled