27 Day Cycle Overview
Ovulation: Day 13
High Fertility: Day 8 – 14 | Next Period: Day 28
Tracking a 27-Day Cycle
For a consistent 27-day cycle, your next period will begin exactly 27 days after the first day of full bleeding from your previous cycle. While apps use averages, your biology dictates that the follicular phase (the days leading up to ovulation) is what causes this specific length.
Your Specific Cycle Metrics
| Cycle Day | Biological Event |
|---|---|
| Day 1 | First day of period (Full Flow) |
| Day 8 - 14 | High Fertility Window |
| Day 13 | Estimated Ovulation |
| Day 28 | Next expected period / Testing Day |