Boy or Girl??? *12 & 18 week scan pics*

[cloudburst88]

Hi there,
I'm just wondering what everyone thinks, is it a boy or a girl from my 12 and 18 week scan pics?? Any clues ie skull or nub theory? Thanks!

a1.sphotos.ak.fbcdn.net/hphotos-ak-snc6/264913_139876562757008_100002039942822_264345_3866445_n.jpg
a3.sphotos.ak.fbcdn.net/hphotos-ak-ash4/265138_139876606090337_100002039942822_264346_7855605_n.jpg
a3.sphotos.ak.fbcdn.net/hphotos-ak-snc6/s720x720/282116_159279384150059_100002039942822_324536_6298769_n.jpg
a5.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/282562_159279414150056_100002039942822_324537_920594_n.jpg

There's not much to go on - they're not as clear as they could be. I think, but a bit tentatively, girl.

My guess would also be girl. Not 100% if I can see the nub or not.