It has been claimed in 2013 Kate, who is a big fan of working out, changed how she did it in her pregnancy.
Kate has always been a fan of running, joining a running club at St Andrew’s university.
She has also been spotted numerous times running around Kensington Palace by those walking in the grounds.
She’s played hockey while at school and is a the Patron of the All England Club, a tennis organisation.
It helps expectant mums to stretch and maintain strength without straining themselves.
It also helps expectant mothers to control their breathing, something that comes in hand for labour.
There is another pregnancy sign for Kate Middleton and that is what she is eating.
It was reported by website Self that Kate ate avocados, berries, and oatmeal while pregnant to help with her severe morning sickness.
Charles’s facial expression would give one major clue to whether Kate is pregnant, a body language expert told Express.co.uk.
The first-in-line to the throne is a doting grandfather, and his delight in a new grandson on the way is likely to be observable.
Body language expert Judi James said: “As Prince Charles has got older he appears to have relaxed the rules on PDA.”
The once more uptight public visage of the Prince of Wales has become more family friendly recently.