Skull or nub theory? Can you tell?

I had my NT scan yesterday and measured 13wks. Two techs in the room kept calling baby a boy and now I'm really curious. I didn't ask what they thought because I thought it was way too early to guess. When they did a potty shot I thought I saw something between the legs, but also thought it could be part cord. Any guesses here? I know the pics aren't the best.

http://i1092.photobucket.com/albums/...ps3c5ae8cc.jpg

http://i1092.photobucket.com/albums/...psa37a4555.jpg

http://i1092.photobucket.com/albums/...psae7a0c2d.jpg

There may be the faintest hint of a boy nub in the first image but I'm not certain so wouldn't really be surprised either way.

I say BOY

I added a third photo, not sure if it helps any!

iM LEANING BOY but no idea why

boy!

Boy :)

Thank you for the guesses! Can't wait to see what we have!

Thinking boy!!!

looks boy to me :) x