They'll probably be able to tell you what you are having- depending on what way the baby decides to lie on the day (sometimes they won't co-operate at all)

it's funny- I didn't much care what I was having the first time around- but when they told us it was a girl, we both just teared up straight away, and decided that we must've wanted a girl the whole time.
I'm sure if they'd said "boy" we would've felt exactly the same.
Don't worry about your husband being dissapointed with a girl- she'll be his little princess, and i'm sure she'll love playing catch in the backyard with her daddy.
We were quietly hoping for another girl this time though- 'cos I think a girl needs a sister, and my husband is always keen for girls he has 3 brothers so he's over boys. We found out we were indeed having another girl at my 20 week scan- and even though we were both delighted with the news, we both admitted to feeling a little pang of loss for the boy that it could have been - just for a moment !!!!!!!
You'll be delighted whatever they tell you.