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If your prolonged periods and associated symptoms have been diagnosed as endometriosis and with chocolate cysts or blood cysts on ovaries, then ovulation may or may not occur depending on the extent of ovary involvement and the probable ovulation days cannot be predicted accurately based on only your period duration and menstrual cycle length information.
If you want to predict or time your ovulation, go ahead with following the BBT (basal body temperature) or cervical mucus method or calendar method to chart your probable ovulation days.
Visit your gynecologist for further aid with these along with use of ovulation kits and possible serial ultrasound scans (follicular scans) to monitor growth of the egg in ovaries and predicting its release.
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