I struggled with this question for AGES this time around... I found out with DS, because I knew that I couldn't wait till birth to know.
This time around, I finally made the decision to find out - we asked at the scan - nothing conclusive because bubs was being unco-operative.
So sometimes even when you want to know.. you can't !!!!! I did really want to know, not for clothes or anything like that, but because I would like this one to be a girl, but have made my peace with not knowing, and since we are having a third child anyway, doesn't really matter if this one is a boy.
Although - it would be helpful to know as I can only find girls names that I like and am struggling on finding boys names!!!!
Good luck in whatever you decide..