Is there a way to tell if someone is accessing my camera?
If you use a unique password for Wyze, as you should do for all your IDs, then it is highly unlikely. However, the best way to make sure is to change your Wyze password to something new & unique. If anyone is accessing your cameras, their feed will go belly-up on the next authorization, which is typically any time you call up a camera.
Turn 2FA on too.