Skull/nub guesses please

I don't think you can see a nub but if you do can you give me your best guess on nub and/or skull.
ThanksAttachment 12549

If that bright white line at the bottom is the nub I'd say girl since it appears parallel to the spine. I think the skull theory is 50/50 in all cases. What gestation?

I think girl but it's not the very best pic.

12w1d. Thank you for your responses