well it all depends on how you are going to deliver, the gp should of gave you all the options.

you can book into a ob,you will see them throughout your preganncy,a nd they will deliver your baby, you need a referral from your local gp.

or you can go through the public system, most hospitals have antenatel clinics, which you will be seen by a midwife, on your visits, and certain visits you will see the hospital ob.usually the midwives deliver the bub, but the hospital doc, will also be around, if there is complications

or there is shared care anetantal clinic+ local gp, if you are thinking about anetatal, you just have to ring your hospital, and they will ask you due date, then they will book you in for your first appointment, which is usullay around 12 weeks, unless complications, this visit is usually alot of paperwork, and medical history etc

i hope this helps