It is possible your body may be going into pre-menopause. You can get a blood test to determine this with your doctor. Other cause for irregular menstruation can include: Possible pregnancy. Other causes can be; stress, weight gain/loss, medication, illness, climate, cyst, or polyp of the cervix, hormonal. Thyroid, infection, .. just to name a few.
Without a proper exam it would be hard to pin point the exact cause. So you can either wait and see if this occurs next month as well, or if you go back to your normal schedule.
Hope this helps, If you need anything else please feel free to ask. If you found this helpful don’t forget to click the *accept* button!
