You can't access your superannuation for any reason whatsoever (except to change investments etc, but the money still remains the property of your super fund) until you reach retirement age.
Correction- there are two categories. Severe financial.hardship, and compassionate grounds. IVF is a medical expense but would probably be considered elective, and not necessary to your survival. Harsh, and very black and white unfortunately. I recently was denied access despite financial distress, because I was unable to obtain one lousy letter from centrelink. Sucky. Best of luck, hun.