nub or skull theory guesses?

Hi everyone im.new here. The skull pics were taken at 15 weeks and not sure if you can see anything from the nub pic but that was taken at 9 weeks 6 days. Guesses anyone??

Thank you

maybe on the skull i'd say boy

that bottom one has a possible girl nub in it..

possible girl? not sure.

Thanks for your guesses everyone :)

I don't see any clues.