it is normal. when i was 33weeks i was worried that my baby doesnt move much as before. i even went to the emergency maternity hospital to check. baby is fine, he just chilling. was told that as baby grows, there is less space for them to be actively moving like before. there will be a decrease in movement as your baby grows. however if you worried, go get checked for a peace of mind.
Better consult your gynae asap