If its any comfort, I cried when I found out mine was a girl...I have one dd, and this is definitely our last (age, age, and age) and I cried because I'd never know what it was like to be mother to a boy (a fantasy boy, of course ).
I also knew I'd cry whatever it was, because its our last - and I wanted a girl too.
And like you, I'm so glad I found out - it was five weeks ago, and I've already got most of that out of my system - just saw her on a scan again, and am in love.
And most of all, congratulations!