Read this essay describing the feelings of someone who will soon be a first time parent. It sounds like many of the things I was thinking when I was in the same boat. Check out this post from furia log:
[snip...] Nothing is ending. Or a thousand things are ending, both huge and trivial, like they do while you're waiting for anything new. It's weird that we're in charge of picking our daughter's name at all, weird that we're going to be making command decisions about another person's life, weird that it will be so long until she has the powers to which she's inalienably entitled. [snip...]
(from: The End of the Sky(e))
All the best, glenn!