What Devices are connected with my apple id?

Check your device list to see if there is a device signed in that you don't recognize. You can remove the device using the steps in the article below. As a precaution, change your password.

Apple ID device list -Check to see where you‘re signed in.   * 

 Apple ID Password Change.   -  

ASC YouTube for How to reset your Apple ID password

 What to do after you change your Apple ID or password - Apple Support  -   I suggest doing this before you change your Apple ID or password.

You can see the devices signed into your account at icloud.com or on your Mac.

On your Mac see this in the panel on the left when you navigate to System Preferences > Apple ID