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Cramps which occur a week after menses suggest possibility of fibroid uterus
or endometroisis. There is something present in the uterus which is causing contractions. Anaemia
will not cause contractions , rather just increase weakness, bleeding. Have you been bleeding a lot. You may need to get a thorough checkup by your Gynaecologist and also get urine test and blood test
to rule out urinary infection and anaemia. Eat food rich in fresh fruits and green leafy vegetables, drink plenty of water.