Millions of people are using period-tracking apps to record their menstrual cycle.

In some cases, women are relying on these apps to prevent pregnancy, or to tell them when they’re most fertile when they are trying to have a baby.

How accurate are they, and should you be trusting these companies with your health data?

Guest

• Dr Emmalee Ford, biochemist at the University of Newcastle

References

• Can I trust my period-tracking app? Here’s what it can tell you – and what to watch out for