How accurate is nub theory?

Yvette

Here is my most recent ultrasound at 10 weeks 5 days. I'm currently 14 weeks 5 days. Our anatomy scan in November 6 but I'm not finding out until the following Friday at our gender reveal. anyways. How accurate is nub theory and does this look like a boy or girl??? We already have a son. I'll be happy either way but would love a baby girl!

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