I would imagine you would be higher risk because of the borderline result for GD, and also because of your past eating disorder because during and after pregnancy you are more likely to suffer a relapse of such a condition. However I've never heard of medium risk before, usually a person if either high risk or low risk, so I don't know what your OB will recommend. It may be something as simple as extra monitoring in pregnancy with no change of birthing options. My advice would be to write down a list of questions including exactly why you have been classified as higher risk and what this will mean so that you don't forget to ask anything in your next appointment.