Gender prediction- girl or boy?

[Annie1306]

Hello lovely ladies ! Can you help guess? This is at my private scan at 15+4. We decided not to know the gender but it's fun to guess.. thanks! 😀😀

Boy !

@AliBaliBee1234 , Thank you ! Can you please show me how we guess it ?

If you google nub at 15 weeks you can compare to the top photo.