After you have installed the AMP to your website.
Go to AMP validator https://validator.ampproject.org/ and make sure you enter the “AMP version of the URL” meaning (website.com/amp – the one with /amp)
If you see “Pass” in green text then it means that AMP has been validated properly.
For example:
http://www.website.com/amp/
Validator: https://validator.ampproject.org/#url=http%3A%2F%2Fwww.website.com%2Famp%2F