If you have gone beyond what your normal is, it's possible you could be pregnant if you have had unprotected sex. There are several causes for irregular menstruation though, so you need to see your doctor to confirm if you are pregnant or if there is something else going on. Some causes for irregular periods. Stress, weight gain/loss, medication, illness, climate, cyst, or polyp of the cervix, hormonal imbalance, thyroid, infection.. just to name a few.
Without a proper exam it would be hard to pin point the exact cause. Do call your doctor for an exam to determine the exact cause.
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