Meghan will be traveling to Fraser Island but is not expected to participate in any engagements while Harry carries on with the original schedule.
No rocking chair for Harry and Meghan then - but perhaps their little one will at least get their own rocking horse, à la older cousin Prince George.
Prince Harry said: "First of all, thank you for the welcome you have given Meghan and I over the last few days".
The ceremony overran by more than an hour due to a thunderstorm that had made it too risky for the public to take their seats in the outdoor arena, so the Duchess undertook her latest night of the tour with a 10.30pm finish.More news: Pensioner 'depressed' after racial abuse on Ryanair flight
The final public engagement will be at the Nadi International Airport on Thursday morning where the Duke will unveil the statue of Sergeant Talaiasi Labalaba.
The Duke has proved incredibly vocal about his unborn child since the surprise announcement just last week, expressing his excitement for first-time fatherhood at his official engagement on this tour.
It saw the first Gold Medal of the Games go to France but it also signified The Duchess of Sussex's first medal presentation - offering up the Silver Medal to the Australian team.
A royal source told reporters that Meghan was "not sick, just exhausted", adding, "We have to try to pace her".
The royal couple have had a gruelling schedule since arriving in Australia on Monday, visiting Sydney, Melbourne and the regional town of Dubbo, as well as opening the Olympic-style Invictus Games for disabled and wounded soldiers. However, she added that she's doing "pretty well so far", according to several royal reporters.More news: China plans to launch artificial moon to save money on electricity
It seems like Prince Harry can not get the thought of his soon-to-be-born baby out of his mind.
The royal, 34, who is expecting his first child next Spring, shared his wish after a spectator congratulated him on the pregnancy at an Invictus Games event in Sydney on Sunday.
However, she has a very important reason behind her recommendation.
"I think friendships depend on people individually and how personal your relationship is", she said about their close bond.More news: Amritsar train tragedy: Amarinder Singh sets 4-week deadline for inquiry