Skull or Nub Theory Anyone? 12 week U/S

i'm not sure I see a nub.

Thanks guys, I updated with a new photo because I totally thought that white line was the nub, it's in a post called new photo... Thanks so much for pointing out that it wasn't a nub there! I want to figure out how to see the nub properly!!

I don't see a nub but I'd guess boy based on skull