I have a friend who worked at a prestigious hospital as a receptionist. Her and her coworkers got vaccinated and after talking figured out the regularity and flow of their periods was thrown out of wack afterwards. Before it had been regular and consistent. Now several months ago research was released saying this was a side effect. It took over 2 years for the scientific community to validate a blatant side effect which these women recognized in the first months. It does make me wonder how long it will take for subtler effects of these fast tracked vaccines to be recognized as more than just anecdotes.