Research is asking questions that haven't been asked yet. Research is adding new knowledge to your field. Conducting research for your Ph.D. is much different from taking classes. It's like hiking a well-established trail up a mountain. Conducting research is like reaching the summit of that mountain to find a featureless plain stretching ahead of you - and having to blaze your own trail across it.
Research lacks the familiar, comfortable milestones of course work.
Then come back in a few years and let us evaluate just how original you were. It will be up to you, with the help of your advisor, to set your own checkpoints to evaluate your progress across the plains of research. Send e-mail and tell us.