If you are PR, I suggest you to buy private insurance now and government will pay 30% for you if you live in Australa as PR for less than 12 month. Over 30,after 31 birthday you'll have to pay loading, which means the fee would be higher. Choose hospital cover if you plan to have baby soon.
You need to do your home work to compare different plan offered by different private health benefit provider. such as Medibank, HBA, HCF, blur, blur.