Firstly, Congratulations on your wife's pregnancy!
The
Fair Work Ombudsman has a good resource on employment during pregnancy.
"
It’s illegal to discriminate against an employee because they’re pregnant, or because of their sex or family or carer’s responsibilities. For example, an employer can’t demote or fire an employee because she is pregnant."
Because of this, it is up to your wife when she announces her pregnancy to her boss and colleagues. Your wife may consider announcing her pregnancy to her boss at the earliest opportunity (for example, at the end of the first trimester) so that her boss, and the wider workplace, can make appropriate arrangements to maintain workplace safety for your wife and cater for any potential absences from morning sickness, etc.
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