Nub theory scan help! Can you help me guess the gender of my baby?

[Bluegirl12345]

What gender do you think our baby is based on the attached 13 week scan? I wanted to use nub theory to guess for fun but I can’t locate the nub? Where is the nub and what do you guys think the gender is? Thanks 😊

@Bluegirl12345 can't see a nub on this scan photo, do you have your 12week scan? x