27 Day Cycle Overview
Ovulation: Day 13
High Fertility: Day 8 – 14 | Next Period: Day 28
Phase Breakdown & Health
A 27-day cycle is composed of two main halves. The first is your Follicular Phase (lasting roughly 13 days). The second is your Luteal Phase, which is structurally fixed at around 14 days. If you recently stopped hormonal birth control, expect it to take 3-6 months for your natural 27-day rhythm to fully stabilize.
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 |