Go here: https://myaccount.google.com/security?pli=1 https://myaccount.google.com/security?pli=1 This page allows you to review your security settings. Most im

Go here: https://myaccount.google.com/security?pli=1 https://myaccount.google.com/security?pli=1 This page allows you to review your security settings. Most importantly, have a look at linked apps (I'm on a different language so I don't know the exact terminology, scroll down bit and you should see it). Revoke access to any app that you don't know / doesn't feel right. Definitely enable 2 factor authentication on your Google account. Change your password. Review your security questions and answers as well. Also have a look at https://security.google.com/settings/security/activity https://security.google.com/settings/security/activity This page shows you on which devices you've been signed in, and where they are from. If you notice anything suspicious, click the link at the top of the page.