Nub angle Boy or Girl?

Jess
Hey guys! I've been googling a lot about this 'nub angle' theory to detect at a 13w scan if your baby is a boy or girl. 
I don't really know what to look for, can anyone that knows what I'm talking about please have a look at my pic and see if they think my baby is a boy or girl? 😁
Just curious but will obviously find out at 20w scan 😍