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According to Helen Cheyne, professor of maternal and infant health research at the University of Stirling, "it is not known" how a cryptic pregnancy like Bryony's can happen.

Prof Cheyne explained before modern methods of testing for pregnancy, women relied on more subtle signs that indicated they were expecting like feeling the baby move, which typically doesn't happen for first-time mothers until about 20 weeks.

While working as a midwife in the early 1980s, Prof Cheyne met a woman in her mid-40s with other children who claimed to have had a cryptic pregnancy.

Prof Cheyne said as few pregnancies were cryptic, it is not something women needed to be concerned about.

Mr Cheyne was able to send them a link so they could watch the footage - and it brought back some special memories.