Congratulations!

If you are eating a healthy, balanced diet, you should not need any supplements apart from folic acid
Iodine is also VERY important in pregnancy and most Australian's are deficient. Taking a supplement of folate and iodine would be recommended at a minimum, however I prefer to take a pregnancy multi for the added calcium (baby will leech it from your bones if needed), iron and all the rest. If you're looking for a pregnancy multi without fish oil then be mindful that many of them skip things (Elevit doens't ahve iodine, fabfol doesn't have calcium etc.). I take Swisse Pregnancy Ultivite and flaxseed oil capcules for my omega.