19 week ultrasound and overweight

So I'm going in for my 19 week scan tomorrow, where they will look at the anatomy of the baby and reveal the gender. 
I'm 5' 5", and weigh 225lbs (lost 25lbs recently!). How many ladies out there have had success on getting a clear ultrasound and found out the sex of their baby while being overweight? I'm starting to feel like I'm not going to  see and hear what I want to tomorrow :/