How to show user already exist in google authentication

My google authentication is working perfectly. But i want to show a alert if the email is already registered.But in my case after trying some of the community post, i have added a block but it’s not working for me. A new user account is creating smoothly but if the user email already exist the spinning notifier not stopping. How to set the blocks properly

Whenever user signed in , call your database. Especially email … if the given email is in the list just alert them or else save the details in database and continue

can you please show me the sample blocks for that?

When login button click
Get email database

When database get text or value.
If Is in the list email text, list - database
Then Alert email already exists
Or save email in database also other blocks that are addeded in the login button click right now

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