The OB doesn't want to say with 100% certainty since I'm just 16.3 weeks, but he pretty much said..."Yeah, I think it's a girl." He saw what looked like a "hamburger" with no hint of a penis anywhere above it...all black space. He said not to buy pink just yet, but it sounded like he was pretty sure. We'll know for absolutely sure in 4 weeks at the BIG ultrasound.
But.....I'm calling it! :) I've had a feeling all along that it's girl and so far I've been right with the rest of my kids.
The other great thing too is that he also saw a nasal bone present, 4 chamber heart and in the correct position, good fluid levels, etc. So...she appears to be very healthy thus far. Phew!
Her name will be...Annelise Gianna. Pic attached.
My Ovulation Chart 
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