When does the baby’s movements slow down?

Kristen • Mama to one boy born May 2019 - currently TTC baby #2, wish us luck 😍

I’m 36 weeks and I’ve noticed today and yesterday that I haven’t felt as much movement and they are not as strong and frequent as they normally are. I have a Doppler and I’ve checked for the heartbeat. I do still feel little things here and there but it’s beginning to concern me. Is there something wrong? 🙁