I had my scan done in maternal fetal medicine at my hospital. They have high resolution machines for high risk pregnancies, in my case, advanced maternal age. Yes, the US tech was familiar with the theory. She said it's based on the anatomy of the tube the sex organs form from. She did say it's not 100% but would be shocked if our baby didn't end up being a girl. That being said, we are still preparing to hear boy.
[emoji170]8/2010, [emoji170]6/2013, & [emoji170]11/2015
[emoji166]EDD 9/30/2017 [emoji1317]for pink[emoji166]
https://lmtm.lilypie.com/Tub9m6.png