If you're worried, go and get monitored. It's a myth that baby's movements will slow down towards the end, sure they have their 'quiet' days but they should still be relatively active. I got monitored because I hadn't felt her for a day and everything was fine (actually went into labour that night🙃😂) but always worth checking!
You should be tracking your kick count. Pick the most active time for baby lay down and track how long it takes to get to 10 movements: rolls, kicks, punches. In an hour. My doctor had me start at 33w. If you’ve noticed a decrease in movement for 3 days I’d definitely suggest getting checked out. If nothing else they will find everything is healthy and normal but if something is going on they can catch it early. Fetal movement is the best indicator for how things are going when we’re this late in the pregnancy.
I think you feel the baby the most in the last few weeks. If I remember correctly they say you're supposed to feel your baby a certain number of times every hour and if you dont you need to contact your doctors office
Baby should be moving as much as normal up until labour! If baby has not been moving like usual, any reduced movements should be checked out, no matter how many times you go it’s always best to be checked over x