Hi Sunshine!!
A friend of mine was 8 weeks pregnant the day she turned 16, her baby's dad was 19, and no, the hospital staff never involved themselves in the legal aspects of her pregnancy. She had a wonderful pregnancy and is now the mother of a gorgeous 2-year-old, unfortunately her relationship with bub's dad didn't work out long-term but these things happen.
So seeing as you're over the age of consent, I don't forsee any problems. As another poster said, hospitals see girls as young as 12 expecting babies, it's their job to make sure you and baby are healthy, not go 'dobbing' on you Their main concern would be to ensure that you look after yourself during your pregnancy so you can have a beautiful, healthy baby!!
I'm pretty sure that in Australia, the chances of your partner getting into trouble with the law are very slim if you aren't making a complaint, if that makes any sense - prosecuting somebody for this kind of 'assault' is quite difficult and the law *is* flexible - as in, if you were just slightly under 16, but it was a consensual relationship and your parents/guardians were aware or encouraging of the relationship, it's pretty much out of the courts' hands. And even if, say, a family member was pressing for charges, a judge would most likely be lenient because you and your baby's dad are in a relationship and he is a willing father - even if he were to be convicted of something, he wouldn't get, for instance, jail time, because a judge would see that he is needed at home with you to help raise his child. But, you were over the age of consent when you fell pregnant so there's no worry for you and your partner at all

Please get yourself off to hospital to begin antenatal checkups, the next few weeks are going to simply fly by you so it's time to start getting yourself organised! Just pop up to your local hospital and tell them that you need to start seeing the midwives for antenatal checks, they will help you out. You can also do shared-care with your GP (which is great if you have a bulk-billing one you see for all your regular medical needs), so if you're more comfortable with a familiar face, do that too.

Congratulations on your pregnancy, I'm glad you have the support of your partner during this time! Becoming a parent is hard on people of all ages, but it's such an amazing experience. We have a forum here for young couples, and lots of other discussion places that I'm sure you'll find helpful, so if you have any questions don't hesistate to ask, good luck with your pregnancy and welcome to BB