Ultrasound and tummy fat

I am going to have an elective gender scan at 15 weeks this saturday and i am really worried they wont be able to get good images because of my stomach fat. I am 5’5 and 200lbs so i am considered obese in this pregnancy. Most of my weight is in my stomach. Has anyone has problem with a sonogram because of stomach fat? Any suggestions would be helpful. The scan wont be at my doctors its at a private ultrasound place called sneak-a-peek so internal scan is not an option (i dont think).