Google knows a lot about you based on your habits when using Google services. Here's how to check your Gmail account to see how many conversations are saved to your account, how many emails are in your Inbox, Sent, Drafts, and Trash, plus how many chats you currently have open.
Check your Gmail stats and habits
To find out what information Google stores for your Gmail account:
Open Gmail and select your profile picture (found in the top-right corner of the screen).
Select Manage your Google Account.