Nub Theory

So ladies, how many of you or people you know have had a gender prediction at 12+3 (Nub) and it's been correct? It's pretty obvious if it's a boy but with girls (to stay girly) there's still time for development up until 12+6. I've had a group of Nub specialists look at mine & they say girl, but with time to develop! I'm praying it stays a girl! I'd love one of each & I already have a handsome boy :) TIA