Predicts upcoming period dates from cycle length and last period.
The menstrual cycle tracker logs the start date of recent periods, calculates cycle length statistics, and predicts the next period start date.
Cycle length = Days from start of one period to start of the next Average cycle = mean of recent cycle lengths Next period start ≈ Last period start + Average cycle length
Last 3 period starts: 1 Jan, 30 Jan (29 days), 26 Feb (27 days). Average cycle = 28 days. Next period ≈ 26 Feb + 28 = 26 Mar.
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