Especially if you're a small woman or if you have a short torso, it's completely possible that the baby's just running out of room. Babies at that age of gestation also have waking and sleeping patterns, so it could be that the baby's up when you're sleeping and out like a light during the day. If you're uncomfortable waiting until Friday, try calling your doctor's office and ask to speak with a nurse about it. Good luck, and I'm sure everything is fine.
Yeah mines not been moving as much lately (im 26 weeks) eveyone I spoke to just says that some days they are more tired or go through growing spurts and dont move around as much. It honesly felt like she didnt move for three days and nows shes acting crazy again