My scan with Nicky was at 26 weeks- I wasnt very impressed the second time round because the DVD that I got with it appeared to be looped. During the scan I noticed that the tech was stopping and starting every few minutes, but at my 18 week 4D scan he did not do that and let the scan record all the way through....
It appeared to me that he had recorded 4 bits from the scan and looped it until it made up 20 minutes.
I was also dissapointed at the fact that baby was sleeping... smiled a few times but thats about all.
Heres my pic from 26 weeks - I definitely recommend that you wait til around 26+ weeks, the 18 week scan I had wasnt very good.
I got a disc with 80 images, a 20 minute dvd, 1 large photo, 6 small pictures, and the video was put on the internet- it cost £75.
https://i14.tinypic.com/6cncd1t.jpg