Hi everyone! I've been working out for months, mostly just jogging a mile three days a week. In January, I began HIIT workouts four days a week. I've never had a history of irregular periods, but this month I am two weeks late. I last had sex (protected) three months ago and have had three periods since, so pregnancy is practically ruled out. Has anyone ever experienced this before? I have an appointment Friday for a check up but I'm getting concerned since this never happens to me.