Ph.D. Candidate’?

So, I’ve defended my Ph.D. Preliminary Exam (phew), and what lies ahead are the defense of my thesis proposal, and the final Ph.D. Dissertation Defense, of course.

Does this mean I can now call myself a ‘Ph.D. Candidate’, as opposed to a Ph.D. student? Is there a difference in connotation? I’m not really sure about the protocols involved.

If you happen to know the norms (or lack of them), leave a comment, will you?