A useful guide for working parents is available from the Supporting Working Parents website. This Guide covers when you need to tell your employer that you are preganant, rights and restrictions around pregnancy, returning to work and parental leave.
The Law Handbook chapter on discrimination has a specific section dealing with pregnancy discrimination.
General protections under the Fair Work Act 2009 (Cth) also provide protections against discrimination in this area.
Under the Fair Work Act 2009 (Cth) and the National Employment Standards, some employees are entitled to up to two years unpaid leave following the birth or adoption of a child, see The National Employment Standards and the Fair Work Ombudsman. For information about the government Parental Leave Pay scheme, see the Law Handbook page Parental Leave Pay and the Services Australia website.