Nub theory

Cierra
I just saw something on nub theory which I've never heard of so I googled it. Anyways I'm 11 weeks so does that mean according to nub theory if we didn't see a nub from the lower bottom shot on the ultrasound, it could be a boy?? My doctor said he thought girl but I know it's too early to know for sure. Trying to keep the hope going for a boy!