Whenever you change your site from http to https, be it for security or for a ranking signal, it is always good to add a new site in your Google Webmasters Tools. Google is treating these URLS separately:
- https://www.yoursite.com
- https://www.yoursite.com
- https://yoursite.com
- https://yoursite.com
Make sure to set what you prefer for your site: non-www or www.