Some women are reporting temporary changes in their menstrual cycles after taking their dose of the COVID vaccine. Anecdotal evidence from women worldwide had raised questions about whether the COVID vaccine affects menstrual cycles, ABC 7 Chicago reported. "I had my 1st COVID-19 vaccine in January followed by the 2nd in February, and since then I have had hemorrhagic bleeding with clots. This month of April was the heaviest," one woman wrote in a social media post. Another woman said: "My period has been the lightest in years for the past 2 cycles. Was beginning to wonder if I was pushed into pre-menopause."