If its a public hospital you dont need a referral. Just ring them up and tell them you want to go there to have your baby. Dont even bother telling them you've got this doctor, just tell the hospital you'll see their midwives and it should all be fine for you to book in. They actually cant turn you away, so just give them another call and talk again. Maybe they thought you wanted to book into the birthcentre or something, and they were all booked up there. But the maternity ward has to take you.