If you visit your site in the browser, right-click and pick “View Source Code”. This will open a new tab with the code of the page. Open your browser search (Ctrl + F or Cmnd + F). Do a search for “fonts.googleapis.com”. If you find a long string of code with that in it, it’s very likely you’re using Google fonts hosted by Google. If you don’t find this though, that doesn’t mean you’re not using Google fonts. Google fonts can be loaded my different methods that might not show up here. If in doubt, install a plugin like “Disable Google Fonts” or work with a developer.