I'm going to say
I did read somewhere that if the "nub" is straighter it's a girl and on an angle of 30% or more it's a boy.
it looks pretty straight to me....but I'm not a professional ha ha.
The best way I have been able to tell with my friends ultrasound photos is if the profile looks like mum it's a boy. dad, it's a girl. Works for me pretty much every time (unless both parents have a very similar profile lol)
Let us know when you find out!