First ultrasound

Shaylyn

This ultrasound was done at 11 weeks (turns out I’m further than expected). I already have a 2 year old boy, so me && my partner are hoping for a girl this time. I’ve looked up the Ramzi, skull, && nub gender theories but I’m a bit confused. Can anyone guess the gender? I’ll find out sometime in May but I want to see how accurate these theories are.