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It is possible that you have anovulatory cycles (menstrual cycles without release of egg from ovary) which usually occur during pubertal stages resulting in longer gap between periods. Other possibilities include PCOS, ovarian suppression, hormonal derangements, etc. The exact cause can only be made out after careful evaluation. Consider visiting your doctor/gynecologist for thorough examination and further evaluation to look for the underlying cause. Treatment as appropriate (based on examination findings and investigations results) would be started to help you regulate your periods.
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