hmm.. now what?

I am prego with #4. We really were fine with just 3 but I feel someone else had different plans for us. We are soo happy. I am 17 weeks along and will hopefully find out what we are having in a couple of weeks. I think what worries me is that we have been through this so many times there is nothing to prepare for. We have all the clothes, toys, crib, everything we need.. I almost feel like the excitement is missing because we don't have to go get all that stuff. Does that make sense to anyone? I get excited talking about names.. but now that is over.. we have picked those out too. Don't get me wrong. I love this baby and just can't wait for it to come! I just don't understand how the excitement can be gone?