We ask an expert for the truth behind this story.
We asked GP Philippa Kaye if tracking a higher heart rate can really reveal if you're pregnant – and she agrees that yes, a higher heart rate is experienced by all women when they're pregnant, but unless you're using a heart rate monitor, you just won't notice.
"During the first trimester there is a slight increase in heart rate as well as a slight rise in temperature," she said.
"In the story the woman noticed her heart rate being above 100, however if you were very fit and active and had a low resting heart rate such as 65, even a 10% increase would bring your heart rate up to 72 beats per minute which is still well within the normal range so you may not notice it," she added.
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