After a storm delayed the opening ceremony on Saturday night, Meghan decided not to attend the race with her husband and instead rest back at Admiralty House where the couple have been staying.
Meghan, who returned to the Games a year after her public debut with Harry, wore a black Emilia Wickstead Dress.
The former "Suits" star is still expected to travel to Fraser Island - which is the world's largest sand island and can be hard terrain for pregnant women - but it is thought she may not take part in as many engagements as originally planned. Royal reporter Emily Andrews spoke to 35-year-old fan Charlotte Waverley, who revealed the chat she'd had with Meghan on Bondi Beach on October 19.More news: China, Asean navies hold drill to ease tensions
During the reception, the Duke and Duchess met with children from the Kookaburra Kids Foundation which supports families affected by mental illness, the Endeavour Clontarf Academy which helps disadvantaged indigenous men, and cadets from the Royal Australian Air Force.
Britain's Prince Harry today opened the Olympic-style Invictus Games for disabled and wounded soldiers at a moving ceremony on the forecourt of Sydney's Opera House, after an intense thunderstorm forced an hour-long delay.
A royal source said the duchess was "not sick, just tired", and was keen to take part in everything.
"She said she was up at 4.30am this morning doing yoga in her room as she couldn't sleep".More news: Detroit police find 63 fetuses in funeral home amid probe
Prince Harry was left to hand out medals by himself this morning after Meghan didn't show up to an event in Sydney.
The couple fly to Queensland's Fraser Island on Monday before spending the following four days in Tonga and Fiji.
Emily said: "Meghan told me that she's feeling pretty good so far, which is great, and that she's running on adrenaline". From Prince Harry's moving speech to an incredibly sweet and rare behind-the-scenes photo of the newlyweds, we've got your must-see rundown of their tour's pivotal weekend affair.
It was at last year's event in Toronto that they made their official debut as a couple, arriving hand-in-hand and taking in the competitions.More news: Meteor shower over Norfolk october 2018