third sonogram for heart views.

Has anyone else had an uncooperative baby during their sonogram? My second sonogram they still couldn't see all the heart views they needed. And since I'm an older mom my doctor wants to make sure there are no heart abnormalities. She said her office tried two times and if they still can't see the views they want they send their patients to a specialist. So now I made an appointment to see the specialist in a couple weeks. I don't like going for all these sonogram appointments- they push on your stomach and mess with the baby- just leave my baby alone I feel like saying. Like is this really necessary? I know it is but I'm just nervous, and worried.