Mine are both 6 months pregnant and both are showing movement.
Last sunday I took out my stethescope to listen for the heartbeat and while doing so under the tummy of my older mare, I got 'kicked' for my efforts!! Unfortunately with my maiden mare I could not hear the heartbeat but there was a lot of activity. So much that my mare lifted her leg to kick her stomach, got told off because I was standing there and then glared at me thinking I was the cause!! Had to laugh because she moved away from me but that didn't stop the movement so she was a bit lost as to what to do next.