The Duchess of Cambridge, née Kate Middleton, has been affected by the severe morning sickness that struck her during her first pregnancy – which has put in doubt her attendance at various events.
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A Kensington Palace spokesman said whether she carried out her planned engagements would be decided on a “case by case” basis.
Kate is scheduled to be among the guests at the opening ceremony of the Invictus Games in London on Wednesday evening along with William, Harry and the Prince of Wales and Duchess of Cornwall.
The following day she was expected to attend a solemn Drumhead service at Lee Valley Athletics Centre with the Duke and Harry, and later with William to watch Invictus competitors taking part in matches and heats.
The Duchess is due to make her first official solo overseas tour in two weeks’ time, from September 20-21, representing the Queen at the 50th anniversary of Malta's independence.
A spokesman said: “We will be planning this on a case by case basis - it’s too early to talk about Malta and Invictus.”