i wasn't expecting restrictions to kick in so early. looked up qantas policy (posting for if someone does a search later).

need to plan a holiday soon then!

If you are pregnant, the following precautions must be observed.
For travel after the first 28 weeks of your pregnancy: you need to carry a certificate or letter from a registered medical practitioner or registered midwife confirming:
the estimated date of delivery
whether it is a single or multiple pregnancy; and
that there are no complications with your pregnancy
For flights of four hours or more:
if you are having no complications with your pregnancy you can travel up to the end of the 36th week of your pregnancy for single pregnancies or up to the end of the 32nd week for multiple pregnancies (for example, twins)
medical clearance is required if you are having complications with your pregnancy
For flights of less than four hours:
if you are having no complications with your pregnancy you can travel up to the end of the 40th week of your pregnancy for single pregnancies and up to the end of the 36th week for multiple pregnancies (for example, twins)
Medical clearance is required if you are having complications with your pregnancy
If you wish to travel within seven days after delivery, medical clearance is required. Infants cannot travel for 48 hours after delivery and need medical clearance to travel between three and seven days after delivery.
Please Note:
We do not represent that travel is safe for you at any particular point during your pregnancy. You must seek advice from your own medical practitioner prior to your flight. The periods referred to above are only our minimum requirements
Some countries place limitations on the entry of non-national pregnant women. Check with the relevant embassy or consulate before you travel to confirm any further limitations.