Nub or skull theory guesses?!

[elm26]

Hi everyone

Just wondered if anyone would look at my scan photos and tell me if they think boy or girl?

We have a daughter already and would be over the moon with either sex.

Thank you!

Not the best pictures for nub, but on one of them I’d say boy

I'd say nub is only vaguely visible in the last pic and think it's showing a stacked nub, boy is my guess ☺️