Congratulations Depends what state you are in I guess. You need to choose who will be monitoring your pregnancy weather it be an Obstetrician or shared care with your GP. Your regular GP should be able to tell you what your options are. If you decide to go through an Obstetrician you will need a referral and will probably have to book in asap as they are usually booked up.
I am pregnant with my first so someone correct me if I'm wrong! And good luck with your pregnancy!