Section/UC Baby/Ultrasound

I finally booked my UC Baby appointment for next month! Can't wait to find out what I'm having😁 I have my boy so hoping for a girl lol! Does anyone know how they do the ultrasound? I had a section with my son and that was 2 years ago! And other then when I wash nothing has touched my scar in 2 years! So when I went to my first ultrasound it hurt with the ultrasound tech pushing on it and I was just wondering if that's what UC baby uses or if they use the vaginal one? I'm just curious! After about 10 mins it stopped hurting it was just an initial shock and it really hurt!