can someone help with the skull/nub theory in this picture I'm 13 weeks and 0 days.

I'm 13 weeks and 0 days in the picture. It was a US NUCHAL TRANSLUCENCY TRANSABDOMINAL 1 FETUS 11-13 WEEKS. The heart rate was 146. Can you guess the gender with the skull and nub theory.Do you think team blue or pink and why? Thank you in advance