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If you are having irregular cycles which may have been brought about after sexual intercourse it could be problem with the cervix or hormones. You should get a PAP smear
and get ultrasound
to look for PCOD. Do you have any burning sensation on passing urine. Drink plenty of water. Get your urine tested for urinary tract
infections as well. You can take T.Pause MF for relief of severe pain
and increased bleeding till then, under medical supervision.