So I think it's a girl? Can someone explain how to tell?

I've read stuff online about the Nub theory.. I THINK I see the nub, but it's hard for me to tell. This was the best quality pic I could get 🤷‍♀️🤦‍♀️. I zoomed it in some to help.

This was at 13weeks 2 days. I find out next week though genetic testing.

Thank y'all 💕

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