No advice either but dd was generally small at her 20 week scan and we had to come back (lots of times as it turned out) so understand how worrying the wait is.
I am really no expert but I wouldn't necessarily worry about the lack of movement, s/he may have just been chilling. Am sure someone will be along with experience of this particular thing but I would advise writing a list of questions to ask next week as I know I always forgot what I wanted to ask once i got in the room.
Good luck.