If you're ever concerned go get a non stress test done. I had to yesterday as I could feel my LO for two days as much as normal.
Also, baby's do NOT move less! Their kicks aren't as big because it's a tighter space, but they should continue to move regularly even through labour.
Please go to countthekicks.org
it could save a baby's life.
I'm 33 weeks and I get a NON STRESS TEST weekly, I thought she wasn't kicking as much but the tech says she's a mover and a shaker. But if your worried go to the triage and can your Dr. I needed to hear her heartbeat and see her, when she decided she was going to slow down.
As long as you're still getting 8 to 10 movements in a 2 hour period, you're good. Anything less, and I'd call just to be on the safe side.
My doctor told me toward the end the baby dont move aoffz much because its not alot of room and the baby sleeps alot as long the baby kicks everyday I think your ok