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Would you use an app to avoid getting pregnant? Over 100,000 women in the UK are doing just that – with contraception app Natural Cycles.

It calculates when a woman is most fertile to help her decide whether or not to have unprotected sex.

However, anecdotal evidence suggests some women are falling pregnant whilst using the app – so how reliable is it?

5 live’s Chloe Tilley speaks to its chief technical officer, Elina Berglund, to find out more.