Stress is a big trigger of irregular periods for me. No need to see a gyn either, at this point. Discuss it with your family doc. I didn't have a period for 6 months! No birth control, tubal ligation, but was really stressed, then I got it once and then skipped 3 months. Not pregnant, so my family doc said hormones outta whack and prescribed me 5 days of progesterone and boom I had a period and have only skipped once or twice since.
Stress, illness, hormones, anything could cause it. Just try to stay calm and see your family doc first.
Good luck!
Kimberly.