I have a work conference in Melbourne that I was looking at going too.. I jumped on the airlines website and they say they wont allow travel after 35 - 36 weeks of pregnancy. Go on their websites and check it out as I cant remember the exact details. But really, the choice is up to you, if you are healthy and feel up to it then I would go. However, I travel from the Gold Coast to Melbourne quite a lot and it is a pretty long trip.. at least when you are pregnant!