Wellllll....I'm a cross country runner. And my season started August 10th and ended September 29th. I ran 5-6 days a week for 1-2 hours.  My last period was August 24th and it's October 4th and I haven't started yet. I've been a bit worried but I know 100% that I never did "it" I'm 14. But I still think I might be pregnant even though idk how that would happen. But can running and stress/anxiety cause delayed periods????????