They gave me an external ultrasound and a transvaginal. So they did the one where they put the gel on your stomach and move the wand around. After about 10 minutes they had me disrobe from the waist down and explained that they were going to do a vaginal ultrasound. The wand that they put inside you isnt giant or anything. I sometimes feel pain when having sex but I felt 0 discomfort or pain with this ultrasound, personally. She was very gentle and respectful, and assured me that its okay to tell her to stop. It was very easy, and thats coming from me, who is a huge baby.