How do you find the exact time u would ovulate? How many days after u began ur period?

Ovulation. Ovulation typically takes place 14 days prior to the menstrual cycle. Therefore, in a 28 day cycle, ovulation usually happens at approximately day 14. In women who have cycles greater than 28 days, ovulation will take place later than day 14. In women with cycles shorter than 28 days, ovulation will take place earlier than day 14. Ovulation predictor kits can assist in telling you when you ovulate.