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Read your prob, by getting follicular study
you come to know about maturation of follicals n time of its rupture n ovulation. uaually ovulation occure between 12 th to 18 day of period so you should get follicular study on 10th ,12th ,14th, 16th day of period. it shows about maturation of follicals, its rupture, about ovulation. so that you come to know about your fruitful period.