Was nub theory wrong for anyone?

So based on nub theory of my 12 week 4 day scan, I’m having a boy. I’m disappointed because I wanted to do a gender reveal with family but now I’m certain based on that theory it’s a boy. I saw a forum on the what to expect app and that’s how I stumbled across the theory.

I am equally happy with either gender I just wish I hadn’t read the forum and ruined the surprise! 😔