I think your in the right place...lol...I have questioned this theory myself and have done some reading...but like everyone had told me, there is no sure fire way of knowing till the doctor confirms it or the baby is born...lol...
But from what I know and can tell from your U/S picture...it looks like you could be having a girl. Since girls are suppose to have soft, curved foreheads and boys have a more straight/slanted forehead.
Here is my 14w1d U/S that looks to me like a boy...which is what I am hoping for!