AceShowbiz - Meghan, Duchess of Sussex is on the mend after pulling out of an event due to exhaustion.

The 37-year-old, who is expecting her first child, is currently on her first official tour of Australia with her husband Prince Harry, but was notably absent at a cycling event as part of the Invictus Games in Sydney on Sunday morning, October 21.

According to reporters at Daily Mail Australia, Harry told competitors that his wife was resting at home as "being pregnant takes its toll."

Meghan, who is about four months pregnant, spent the morning resting after an unexpectedly late finish to the opening ceremony of the Invictus Games.

However, she looked rested and rejuvenated as she re-joined the planned schedule - a reception at The Pavilion restaurant in Sydney's central parkland The Domain - after skipping the cycling presentation.

Hosted by Australian Prime Minister Scott Morrison, the couple joined Invictus competitors and their family members for a lunchtime gathering to hear more about the games.

Harry and Meghan later looked loved-up as they watched the final of the Invictus Games' sailing competition from a luxury boat in the afternoon.

The former Suits star has already revealed she was suffering from jetlag on the tour and had been practicing yoga after waking up unusually early at 4.30am.

Due to her pregnancy, a spokesperson for Kensington Palace has also confirmed that Meghan will not be fully partaking in events on Fraser Island for the seventh day of their trip.

Editors at U.K. newspaper The Telegraph have reported that there are concerns over the terrain of the sandy island, where journeys involve a bumpy car ride which often leaves tourists feeling unwell.

"After a busy programme, The Duke and Duchess have decided to cut back The Duchess' schedule slightly for the next couple of days, ahead of the final week and a half of the tour," a palace aide told the publication.