Charles met Prince Albert of Monaco on March 10th, so yes he was in contact with a confirmed case.
There's a "special treatment" for heads of States, MP's and their families anyway. Sounds unfair for the average Joe but it's done for the sake of the State continuity ...
Completely I also can understand the frustration especially those medical staff who are also being denied tests. There are people very very sick being denied and then we have someone highly privileged being handed a test. No doubt this will create a great dialogue and rightfully so. This whole situation has reminded people of their status more than ever.