Okay. I thought that was part of the leg moving cause ultrasound tech pointed to leg as she was taking that picture and the one right after that you can make out a bent leg and foot.
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That's exactly where I was saying where jark22 has circuled. The nub ain't to pointy it could definitely go either way. I really so hope you get your girl.
If there is a nub in this pic, I agree that it is what jark circled and would guess boy.