12w 1d, nub theory?

Raven • 21, happily engaged and expecting our little rainbow child!
I'm so anxious to find out what we're having! I'm fourteen weeks and this was at 12w 1d for our NT Screening. We were allowed some video and I caught this a couple of times in it. This is the only time baby wasn't moving and was laying still while still being able to see the nub. Any ideas on what the gender may be? I think it's girl, but who knows! 
Also, have any of you had nub predictions and had them turn out to be correct?