She conceived again quickly and stopped taking the prednisolone as recommended, but unfortunately miscarried.

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In comparison, 25.5 percent of women who consumed more than 200 mg of caffeine a day miscarried.

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They found the women who had miscarried were much more likely to carry the variant form of the NOS gene.

BBC: Miscarriage gene identified

She was a member of the Catholic Church but left after a priest told her that a child she had miscarried would never see the face of God.

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Mrs Duggan miscarried again in July 2010, but said that the only way she could work through her grief was to keep trying and she was on a "kind of mission".

BBC: Claire and Jason Duggan