Nub theory?

Michelle • I’m a teen momma to a beautiful 2yo girl 👑due with baby #2 my little man 👣 in March 2019 taken to an amazing man 😍 add me y’all!

So I don't know how accurate this is but I don't quite understand how to do it whats y'alls guessing on the gender? TIA :) this was at 11weeks and 3 days