Agreed. Not having Been through this, but having a doctor as a father, and asking about such a scenario. He told me its just common-place. Most bring their own supplies, as they know what works best, for them. Tell the nurse, or doctor during intake, and that's that.
It's a non issue. Just another day. I think the opposite, of what your dr. Dl. Friend said. Your going to be under stress, mentally and physically. Changing things up would put more stress on things. Not less. Ad to the burden. Not take from it.
-Blake-