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Published 11:43 18 Mar 2018 GMT
Updated 11:53 18 Mar 2018 GMT
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The TV presenter also said that while she suffered from morning sickness in the first trimester, now she's got her energy back and is "feeling brilliant".
Spencer added that he considers himself "the luckiest man in the world," and that they'd be trying for a while. "I think we were more taken aback by how quickly it had worked," he explained.
The couple are the midst of planning their 2019 wedding - but they've yet to settle on an exact date or location.
Spencer is brother to James Matthews, who is married to Pippa Middleton, sister of the Duchess Of Cambridge.
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