Last modified on Fri 4 Jun 2021 10.22 EDT Researchers exploring whether Covid vaccines may disrupt menstrual cycles have said any potential changes to periods are short-term and do not affect fertility. Though any link between the jab and changes in periods is yet to be proven, anecdotal accounts have been highlighted in blogs and on social media. Speaking to the Guardian’s Science Weekly podcast, Dr Kate Clancy, an associate professor at the University of Illinois, and Dr Katharine Lee, a postdoctoral researcher at Washington University School of Medicine, said they both experienced temporary changes to their menstrual cycles after receiving Covid vaccinations, leading them to start a survey to explore whether others had similar stories.