Anatomy Ultrasound Expectations

Rachael
Hey there!
So next week I will be having my twin's anatomy ultrasound and am very excited to know the genders. I just wanted to get responses on what to expect and to know if being able to identify the genders is harder since there is less room for the babies to move around? From what they were able to tell at my 11 week ultrasound they are di/di and I will be 20w1d at this anatomy visit. 
Thanks!