Hi @Dj1mtry! At Ring we value your security and privacy, and ensure that there are various measure in place so that your account is protected. In addition to your Cams securely connecting to an already secured wifi network, your Ring app also has multiple authentication factors. Excellent job checking your control center to check for any other users.
Rest assured that the behavior you are seeing is likely normal. Check out our help center article about the Indoor Cam LED patterns to see if any of these would apply. Keep in mind also, any motion settings, scheduling, or linked devices you might have in the Ring app. If a motion was triggered it should show up in your event history. I hope this helps! 