The children and grandchildren of the queen are princes and princesses - that's why Harry has that title - but this doesn't apply to great-grandchildren.
And as the happy couple arrived in Australia on Sunday for their first official tour since they got married, Meghan oddly carried purple folders in front of her stomach, with many people quickly putting two and two together.
"The Queen, Duke of Edinburgh, Prince of Wales, Duchess of Cornwall and Duke and Duchess of Cambridge are delighted for the couple and were able to congratulate them on Friday at the wedding in person".
Days after watching Harry's cousin Princess Eugenie tie the knot in a lavish ceremony in Windsor, the couple touched down in Sydney on an overcast morning after a regular Qantas Airways flight from London with a brief stopover in Singapore. Meghan and Harry just kicked off a royal tour of Australia on October 14, so we'll get plenty of look at Meghan's maternity style over the next few weeks.
The tour coincides with the Invictus Games in Sydney which start on Saturday.
The royal couple announced Meghan's pregnancy Monday, just hours after she and Harry landed in Sydney.
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During Sunday's interview , Mr Trump cast doubt on making any changes, saying the scientists "have a very big political agenda". I will say this: I don't want to give trillions and trillions of dollars.
Prince Harry and Meghan Markle hold hands as they visit the Admiralty House in Sydney, Australia, on October 16, 2018.
The palace said the couple had sought medical advice and chose to continue with their plans. Both the Centers for Disease Control and Prevention and the UK Foreign Office advise pregnant women to postpone travel to areas where there is a risk of Zika infection.
Prince Harry, of course, is one of the founders of the competition for injured military personnel. And the royal couple were delighted. "Wishing them all the best", May tweeted.
Harry and Meghan said during a television interview in November that they wanted to promote humanitarian causes close to their hearts across Commonwealth-member countries, including Australia.
Interestingly, it's hard to say if Baby Sussex baby will receive a royal title.
He has been an 'emotional wreck - but in a good way!' since discovering the Duchess of Sussex is pregnant, one source told the Daily Mail last night. Harry has been patron of the WellChild charity since 2007.
If the child is a girl, rumors are circulating that the name Diana, in honor of Harry's mother, may be another option.