I've been so stressed the past few days (s**t on by a dear friend to the point i actually collapsed with low blood pressure from stress), that i hadn't noticed properly if the baby had moved, the docs said they don't expect a 17 week old to move everyday, but when you'r used of it, it worries u.........however, i got my doppler today and picked up a strong speedy heartbeat and i was having to chase him/her around!!!! 
