Hi All - assume this is a hot topic right now. I have had the first shot of the Pfizer vaccine earlier this month. Am on day 36 yet but no period and negative pregnancy test. I then read about vaccines and menstrual cycles and heard a lot of women having delayed or more painful periods post the vaccine. Any one here with those side effects ? Already hard enough to track your cycles after TTC for 18 months and 1 miscarriage so this is really driving me nuts !