Genderexperts.com how accurate?

[genderprediction]

So I sent my scan off to genderexperts.com. I would like a little boy as I have 4 girls. They predicted a girl. How accurate are they?
Attached are my original scan and their diagram. I can't see how they came to that conclusion. Is that the baby's legs and they just look between? Not sure

Definitely looks like a little girl nub ...have a google on nubs it’s the start of the genitals an points one way or another if a boy or a girl.
I am having a boy and nub theory was correct. It’s not 100% but I think it’s quite accurate x