Thanks ladies, it's actually hubby, not me. I know how desperately he would love a boy and we are undecided as to whether we will have a third child so I'd love him to get his boy. Females run in his family quite heavily (he is the youngest after 6 girls, with three living sisters and he has 4 aunties, no uncles on either side).
I am concerned if we find out at the scan, he will show litte interest in the rest of the pregnancy whereas if we wait, I know he will fall in love with the baby regardless of sex. I really think we're having another girl (which I'm excited about, DD will love a sister!)