When getting a Covid jab you will be read a list of potential side-effects. You’ll even be given a leaflet to take home with the side-effects on them, and none of those includes changes in menstruation. After anecdotal reports of bleeding, Dr Kate Clancy and Dr Katharine Lee speak to Nicola Davis about why they launched a survey documenting events of this kind. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>
