At the time a spokeswoman for the 32-year-old royal said: "She is being sensible about this and is listening to what doctors are telling her. She would never put her pregnancy in jeopardy."
Tamsin Kelly, editor of Parentdish, told MyDaily, "Zara is pregnant, not ill. She looks the picture of energy, health and happiness.
"She is an Olympic winning sportswoman, who is used to being active and will know what she her body is capable of doing comfortably and when she may need to take things easier. Her own mother Princess Anne continued riding up to six weeks before Zara's birth."
After taking pregnancy in her no-nonsense stride it's no surprise to see Zara back in the saddle with no sign of a sleepless night on her face or a sick rag on her shoulder.
LOVE ZARA? See how she rocked maternity wear in her pregnancy style file below.
MORE! Zara and husband Mike share the first baby photo of their daughter Mia with Hello! magazine...