Women whose periods appear to have been affected by the Covid vaccine have demanded clearer health advice about a possible link between the jab and menstrual cycles. Changes to menstruation are not listed as a formal side effect of the vaccine and much of the information is currently anecdotal. The UK’s Medicines and Healthcare products Regulatory Agency (MHRA) has received reports from more than 4,000 people who suffered period changes after the jab. Madison Miszewski, 21, said she had experienced longer, heavier and more painful periods than she had for several years after having her Moderna vaccine in late May....