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If you were sexually active after your last ânormalâ period, and if you are not on any regular birth control measures, then chances of pregnancy cannot be ruled out completely. Other possibilities include hormonal imbalances which can make your periods dates vary by 5-10 days. Consider visiting your doctor/gynecologist for further examination and evaluation to look for the underlying cause. Treatment as appropriate would be started based on examination and investigation results to help you regulate your periods.
Take care.