I've had 5 ultrasounds so far, the last being 21 weeks and only got to see 3d once because I asked if they did it...she used the wand for like 2 mins and didnt get a good picture. How do you get a 3d/4d or HD ultrasound? Do I ask the tech or my doctor or is it something the only do in certain cases? I mean I love seeing 2d but I wanna really see! Lol. I have another ultrasound in 10 days.

*I get so many because there's 2 babies and I've had to switch doctors.