AppleID
I have received an email stating someone on an iPhone 6 Plus has used my ID to send an iMessage, can I find out the location of the phone where this was done please?
iPhone 5s, iOS 12
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You may not be able to determine the location.
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.
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.