How has your relationship with spouse changed after having a baby?

I have been with my husband for seven years and it has always just been the two of us. Children have always been planned and here we are with our first daughter who is due in March. Our relationship has always been very special, we talk about absolutely everything, nothing is sacred, and he always knows instantly if something is wrong. 
I have no reason to believe that anything would change, we are both really excited about the baby, in a fantastic place financially, and on the same Page on the ways that we want to parent. I still can't seem to shake this worrying feeling that somehow our child is going to be the reason we grow apart. 
Am I alone in the way that I'm feeling or did anyone else have these thoughts? 
I have talked to him about it and he says that these thoughts are silly that nothing is going to change between us and that I shouldn't stress myself out. I believe that he means this but I'm not sure that he understands how much work a baby is going to be in the way that I feel I understand. Things are just so good now and I can only hope that it gets even better because I am so scared to lose the person I love so much.