Funny, I had a dream like that but I had a son. I know what you mean, missing someone that doesn't exist yet. Great poem! Keep writing!

How could I have known you already daughter,

before you were even born?

How is it that I love you already,

and miss you more than I can say?

hahaha, I love it :D it kinda feel deep for me, LoL xD btw sorry for bad grammar, english is not my mother tongue ._. keep writing, okay? xD