Is there a nub?

I had my first ultrasound today at 15 weeks.
I'm trying to look for a nub to tell the gender, but i'm having no luck :(

Attachment 31517
http://i.imgur.com/XjcB9BY.png

I would guess boy.

Boy guess too

Sent from my SM-N920I using Tapatalk

where are you guys seeing the nub? If i'm looking at what youre looking at, it looks to be pointing down....doesnt that mean girl? : o

The white spot over the flat line is what makes me guess boy.