I am currently 18 weeks pregnant with baby 3, my other 2 are older now (10&8) so I feel a bit like I'm doing this for the first time over again! I have so far felt absolutely nothing. Not so much as a flutter. It's a bit concerning how I keep reading that people who have had more than one baby should feel movement by now. I have a doppler and can hear the heartbeat fine. Should I be worried or am I just massively impatient?