Kensington Palace announced on Saturday that although Meghan will also travel to the island, she will not follow the official visit schedule.
The news of Meghan's pregnancy had sparked fears among royal watchers about exposure to Zika virus, which is officially listed as a risk in Fiji and Tonga.
The former Suits actress, who is expecting her first child in the spring, had skipped a morning of engagements in Sydney on Sunday and sat out the day's events on Fraser Island on Monday, before joining her husband for a walkabout at the end of the day.
Even though Meghan made quite an effort to keep up with Prince Harry and their demanding schedule during her first few days in Australia, she has finally chose to scale back on things.
The couple was scheduled to attend an official welcome ceremony at Suva's Albert Park that will mirror one attended by Queen Elizabeth II and the Duke of Edinburgh in 1953.
The royal visit is taking place during an election campaign, and Harry and Meghan were due to meet leaders from all political parties at a state dinner later Tuesday.
She also wore a tennis bracelet she received from Prince Charles, Harry's father.
The Duke and Duchess on Fraser Island in Australia yesterday.
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Meghan and Harry will have carried out about 76 engagements across their 16-day tour by the time it ends.
Local dignitaries including the Prime Minister of Fiji the Hon Frank Bainamara greeted Harry and Meghan off their Qantas charter flight as they arrived. The lovely shade is in fact thought to be a nod to the nation, with one guest noting the gown was clearly 'Fijian Blue, - a tribute to her hosts.