Unfortunately, there is no official 'list' or 'record' of the items you have copied onto your clipboard, as once you copy something else, it is overwritten and you are left with the most recent thing you have copied. This has proven to be a cause of distress for me on occasion, and if you are asking this question, then obviously it has been cruel to you as well, so I am sorry that there is no real solution for this problem (other than to paste your copied text onto a notepad or safe location before you copy something else).
Hope that helped! =)