I just started what I believe to be my period

Patient : I just started what I believe to be my period 16 days after my last one ended which was 22 days after the one before that. Not sure what is going on here. I have been under stress and just started hiking the pacific crest trail and have hiked 42.6 miles in three days. Is it possible that the stress and exercise are causing this or is it something more serious.
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