Can anyone recommend a brilliant and approachable endocrinologist (pregnancy hormone specialist) in the Sydney or Illawarra area?

I am PG and fear I may MC again due to wildly fluctuating Progesterone levels. Have had some tests run by my FS prior to PG but am getting nowhere.

Ideally, it would be someone approachable enough that they would accept a telephone call, rather than make me queue up for weeks while I am going out of my mind.

Thanks for any suggestions