To get an overview of your campaigns you can check your Campaigns page, by clicking on the Campaigns button located on the left side of Control Panel page.
Inside your Campaigns page is a table which contains information on each campaign you have created or sent out. The third column of this table indicates the status of each campaign. There are but a few different statuses that you might come across:
The above terms are mostly self explanatory - for example the Sent status obviously designates a campaign which has been dispatched. But just in case they're not as self explanatory as we'd like to imagine, clicking on the above links will give you as much information as you might need for each status, including some details which you might deem useful.