You can check who's accessed your website if you have the Wedpass option turned on with the Guest Registration option. This will only work if guest registration is enabled with the wedpass.
1. Log in and hover your mouse over your names and select my website
2. Scroll down to Privacy Settings and click the Edit your privacy settings link
3. Scroll down to the Approved Users section and there will be a list of users who've either accessed your site or tried to access your site. From this area you can grant/revoke access as needed.