Ahem! - Please forgive me, but if studying to be an Endocrinologist that certainly wasn't a nurse - it was a Medical Student AKA student doctor.
It happens all the time - people see a woman and read us as nurses, I even had a consultant who should have known better do it to me the other day, I corrected him rather frostily where I might have let it slide from a patient, but for a woman doctor (even a trainee) its quite irritating.