I have also sometimes dreamed that I was dreaming. Unfortunately, what happened to you is not a real lucid dream because you didn't realize that you were dreaming, you though that you were lying in your bed trying to induce a lucid dream. The important thing is that you kept thinking about dreaming and lucidity in your dream, which may help you another time. Try to do reality checks more often. Also keep in mind that reality checks sometimes fail (it has happened to me) so even if you don't apper to bedreaming, do the RC again or try with a different type of RC.