When did my ovulation day begin?

Ovulation estimation: The ovulation is usually estimated from the menstrual cycle which can from 24 days to 35 days. For any menstrual cylce, if one subtract 14days, it will give the estimation of ovulation date. For example where menstrual cyle is 26days and subtraction of 14days give ovulation estimate of 12days. Good luck.

Ovulation: usually occurs about 14 days prior to the next anticipated regular period.