My staff keep getting pregnant all the time (nothing to do with me, we have a dodgy chair i think) and all the scans I see are b/w photos, and might as well be of the surface of the moon from what I can see.
I live in Germany.
Here the following scans are normal practice in Germany, by every GP:
1st = 9th to 12 th week
2nd = 19th to 22nd week
3rd = 29th to 32nd week
Nearly always in 4D (unless in a very remote area!) The Doc very often uses colour to highlight the blood-system.
Extra scans, other than these three, cost 100 to 125 euros. Video cassette cost 80 euro.
I hope this answers your question.
(LEGS - You are correct. UltraSound scans are on always on a 2D basis, thereafter they can be "Enhanced" to 3D or 4D. Four dimensions, as in width, breadth, depth and TIME, because 4D generates a real-time moving picture. With 3D only a singular polaroid is possible)