So sorry to hear you're not able to find this site! Where exactly are you looking in your account for it? All sites created through the Website Builder in your account can be accessed under the the Websites & Stores tab.
This is where you’ll find the option to select “Manage Your Sites.” Selecting to manage your sites will bring you to where you can create new sites and manage the already existing sites in our Website Builder. Are you unable to see these options? If so, what exactly are you seeing (error message, blank screen, etc.)? I was able to find your website through clicking Manage Your Sites under the Website section of your Constant Contact account.