Re: how to check which devices are connected to my iCloud account
Welcome to iMore. It would be the ones you signed in to iCloud on.
Step 1
Go to the iCloud "Find My iPhone" page from any device and log in to your iCloud account.
Step 2
Click the ?All Devices? button to open the My Devices list.
Step 3
Click the device you want to view to open its Info window.