We've had decreased movement over the past three days, so I called the doctor to check on this new development. She's still moving - nudging and rolling - but none of the strong kicks that had been the norm.
It took a long time to get a consistent heartbeat on the monitor (it's hard to keep someone so small within range during the test) and my hand hurts from pushing the monitor into my stomach for 45 minutes, but it appears she's ok. For whatever reason, she's taking a break.
My guess? She's gearing up for something big :)