Q: Apple watch

Hi

If Activation Lock is enabled, you will be unable to pair the watch to your own iPhone.

In advance of that, to check whether Activation Lock is currently enabled for an Apple Watch, you can enter the watch's serial number here: 

• https://www.icloud.com/activationlock/

To find the serial number:

Find the serial number for your Apple Watch - Apple Support

This support article includes examples of indications that your Apple ID may have been compromised along with steps that you should consider taking (such as changing your Apple ID password and enabling two-step verification or two-factor authentication):

If you think your Apple ID has been compromised - Apple Support