12 week 2 day scan please look!

Just back from my 12 week 2 day scan. Baby bouncing around happy and healthy, mammy is very relieved.
The tech was lovely and when I asked does she have any idea of the gender, she asked what genders I already had. When I said 3 sons she smiled and said ohhh!
Now I'm up the walls guessing lol.
What do you think?any clues?:)

http://img.tapatalk.com/555b110d-4de0-fa8a.jpg

http://img.tapatalk.com/555b110d-4e10-977b.jpg

http://img.tapatalk.com/555b110d-10e2-1a68.jpg

http://img.tapatalk.com/555b110d-113e-c591.jpg

Based on her reaction I'd say girl but based on the nub (if what I see is a nub, i'm not sure) I say boy!
Hoping for others to chime in!

Girl!

Boy nub x

I'm not very experienced at guessing, I think it's difficult to tell. I think it could be either or, but I would lean girl. Good luck!

I dont think we can see the full nub in those pictures. I really hope it's a girl though. Fx and goodluck

I'm not really positive maybe girl from the first picture

Thanks everyone. ;)
Is that the nub the bright white part? Or is that the cord? I'm useless at this.:(

I don't see the nub, i think she said 'oh' just because you have 3 boys, at 12 weeks it can' t be that obvious yet. I think the bright white part is cord but I'm as clueless as you. :luck::XX::luck:

Oh and I find the baby so cute looking at us with its finger in its mouth :)