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Dr. Christine Marie Rubio answered : 7 years ago
Hi there. To be able to calculate ovulation, you have to take note of your shortest and longest cycle. Then subtract 14. For example, if your shortest cycle is 24 days and longest cycle is 28 days, 24-14=10. 28-14=14. Your ovulation can happen anytime from day 10 to day 14 of your cycle.