Anyone have any experience of the nub theory ? Where the angle of the nub can tell if the baby is a boy or girl at 12 weeks? What about the 3 lines (handburger) for a girl or 2 lines (turtle) for a boy? I'm desperate to know the sex of my baby (but didn't find out at 20 week scan as partner didn't want to know) so have spent my time studying the nub and lines and come to the conclusion it's a girl. Anyone know how reliable this is?