Well I am in the exact same situation, except we are coming the other way. (Aussie to NZ)
The only thing I can suggest is to remember that if you are moving in 2 months and you do fall pregnant, you may have morning sickness, and that would be pretty unpleasent while in the middle of moving....
If you have things like a job, house etc lined up when you get to Aus, then I would try now... but if you are not sure of those things, then I would hold off until you have some security, as you want to relax and enjoy your pregnancy, and not feel stressed.