It's a...

...long story, but the gist of it goes like this:

My mother and father have 6 children (5 girls and 1 boy). Their first born was a girl and the boy did not come until after the third girl. My 3 oldest sisters all have boys as their firstborn. Therefore, it is natural for me, and everyone else for that matter, to think that this little one I am carrying is a boy. Long story, short:

We are having a girl!! 

... and Paul is waiting for the next ultrasound... just to be sure :P