Nub theory?

Ashley • Momma of 5 and 1 on the way.

Has anyone ever tested the 'nub theory' to determine gender around 12 weeks?

I'm on baby #5 and have never tried it. It seems like the most legit way tho, considering it actually has to do with their forming 'bits' and none of the other theories out there do. I have no side views of my others at that gestation to compare :-(