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Instinct tells a woman that she is ready to conceive, but to be doubly sure take personal or laboratory tests. For starters, estimate the approximate time of ovulation by calculating the length of the average menstrual cycle. Begin from day one, that is the first day of the menstrual period, and the last day is the day before the next period begins. If the menstrual cycle is 28 days, then subtract 17 days, which equals day 11. Use the predictor kit on day 11 and continue testing until positive. This means that you will ovulate within 24 to 36