Is an Ovulation Calculator Accurate?

Donna wonders how an online ovulation calculator could be helpful for her. She needs to enter her cycle length, and that is all over the place. It might be 28 days one month, then 32 the next month, and 25 another month. Then she might go 3 months without any period at all. She wants to know when she is fertile, but how can she tell with so much unpredictability?

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