Well, sorry to disappoint Royal followers but if she is, Kate certainly isn't putting her feet up and taking things easy.
Here's the proof: the Duchess playing the South African game Three Tins in front of clapping and laughing children at the Commonwealth Games.
The game involves stacking three tins, knocking them down with a ball, then running in to the middle of a square before rebuilding them and hopping over the tins three times.
Not the kind of energetic activity you'd expect an expectant mum to be performing, especially one who had such a difficult first three months when she suffered extreme morning sickness with Prince George.
Kate listened as one of the children explained the rules of the game and then cheered as she knocked the tins over and looked up and smiled after completing the task in her high wedges, shift dress and jacket.
Princes William and Harry later faced each other in opposing teams as they played the same game.
Kate and the Princes were joined by world's fastest man, Usain Bolt, as they visited the athletes' village at the Commonwealth Games in Glasgow.
The young royals and the Jamaican sprint star chatted and posed for photographs as hundreds of people gathered to catch a glimpse of the visitors.
William, Kate and Harry also played ball games with school children after meeting some of the host nation's medal winners at Team Scotland's accommodation.
They were joined on their tour of the site by the country's most successful Olympian Sir Chris Hoy, who is also chieftain of the village.
Their visit comes the day after they joined thousands of spectators at the Games, taking in gymnastics, boxing, hockey and swimming.
They were then given a tour of the recreation facilities for the athletes, where William played video games with some of the Welsh women's hockey team.
All three moved on to the village green where they heard a performance of the Games' anthem for Unicef from a group of local school children.
They then joined in the ball games traditionally played in countries from across the Commonwealth.