blog posts U of I professor investigates abnormal menstrual periods after COVID vaccine Apr 20, 2021 10:30 am by Chicago TribuneIllinois in the News Share on Facebook Tweet Email Images Chicago Tribune (April 20) Kate Clancy experienced abnormal menstruation following her inoculation and wanted to document experiences of others. They expected 500 respondents; so far, more than 25,000 people have responded. Share on Facebook Tweet Email