Simplified hormone-cycle view
Place today—or another date—on a simplified cycle timeline. You will see a calendar estimate and general hormone context, never a claim about your actual hormone levels.
Your dates stay on this device. Nothing you enter here is saved or sent to Flowy.
The calculation
The selected date becomes a numbered cycle day. Estimated ovulation is placed about 14 days before the next predicted period; days after it are shown as the luteal phase.
Bleeding days are shown separately using your usual period length. The remaining pre-ovulation days are labeled follicular, while noting that the follicular phase biologically begins on cycle day one.
Good to know
“Four phases” is a useful teaching shorthand, not four clean boxes. Menstruation overlaps with the follicular phase, ovulation is a brief event, and phase length varies between people and cycles.
Do not use a phase estimate to diagnose hormone levels, schedule medication, prevent pregnancy, or explain symptoms. A healthcare professional can assess concerns using your history and appropriate testing.
Common questions
A common educational model describes menstrual days, the follicular phase, ovulation, and the luteal phase. Menstruation actually overlaps the early follicular phase, while ovulation is an event rather than a multi-day season.
It counts cycle days from the latest period start, estimates ovulation about 14 days before the next period, and places the selected date around that estimate. Your period length marks the displayed bleeding days.
No. A calendar cannot measure estrogen, progesterone, LH, FSH, or confirm ovulation. The hormone notes describe broad physiology, not your personal levels or a hormone imbalance.
Ovulation and cycle timing can shift from one month to the next. Irregular cycles, illness, stress, postpartum changes, perimenopause, PCOS, medications, and other factors make a calendar estimate less reliable.
