A due date is an estimate, and many babies arrive after it. Past 40 weeks, your baby should keep moving in their usual pattern, and any change is still a reason to call straight away.
Past your due date
Pregnancy usually lasts between 37 and 42 weeks, and going past your due date is common (NHS). Your midwife or doctor will talk you through what happens next.
The NHS says induction will be offered if you don't go into labour naturally by 41 weeks. If you decide not to be induced, you should be offered increased monitoring to check your baby's wellbeing.
Movements don't slow down
Your baby should keep moving in their usual pattern right up to and during labour (NHS, RCOG). Babies don't run out of space and stop moving (Tommy's).
Between appointments and checks, your baby's movements are still the thing to keep in mind. Knowing their pattern is what lets you notice a change.
If movements slow down or change
Contact your midwife, doctor or maternity unit now, even in the middle of the night. Do not wait until tomorrow, do not wait for your next check, and do not use an app to decide. What to do.