Do a site search. For example, site:yoursite.com. This will show you your indexed pages.
If your site does not show up in the index, then it may be in violation of one of the webmaster guidelines. Once you have reviewed and fixed your violations, submit the site for a reconsideration request.
Make sure Google can find and crawl your site
Crawling is the process of Google searching new and updated pages that can be added to the Google index.
You can check for Crawl Errors in Webmaster Tools
Also check the test robots.txt.tool, which will let you know if you are blocking Googlebot from crawling your site
Make sure your site has easy accessibility
Create a sitemap, even if you are already listed in the index