Red Tent PMDD shows estimated next ovulation or next period timing under the cycle ring on Home. These lines count down from your logged period starts and personal cycle length—they are planning estimates, not medical predictions.
What the prediction line means
- Next-event line — the smaller text below Day N and the phase name in the ring center stack on Home.
- Counts down — shows how many calendar days remain until the app estimates ovulation or your next period start.
- Follows the date header — the line updates when you scroll Home to another calendar day, same as cycle day and phase.
- Estimates only — timing comes from on-device models using your period logs; it does not confirm ovulation, bleeding, or a diagnosis.
How next ovulation and next period are estimated
- Period anchors — each logged period start resets Day 1 and anchors cycle length for the active cycle.
- Cycle length — for ongoing cycles the app uses your personal average (or a 29-day default until enough history exists).
- Ovulation timing — estimated as the first day of the proportional ovulatory phase (after menstrual and follicular lengths).
- Period timing — estimated as the day after your effective cycle length ends for the current cycle.
- Late period — when today passes the predicted next period start, Expected Today copy adds a days-late count until you log a new start.
✦Predictions help you plan on Home—they are not fertility tests, lab results, or instructions to start or stop medication.
On Home — next-event copy under the ring
01
Date header
Scroll to the calendar day you want. The next-event line below phase and Day N recalculates for that date.
02
Next Ovulation: 1 day
In menstrual or follicular phase, one day before the estimated ovulation start. Plural copy reads Next Ovulation: N days when more than one day remains.
03
Ovulation Expected Today
Shows on the estimated first day of the ovulatory phase when you are still in menstrual or follicular phase timing.
04
OVULATORY
While your cycle day falls inside the estimated ovulatory window before period countdown begins, the line may show the phase name instead of a day count.
05
Next Period: 1 day
In ovulatory or luteal phase—or after ovulation timing passes—one day before the estimated next period start. Plural copy reads Next Period: N days when more than one day remains.
06
Period Expected Today
On the estimated next period start day when you are still on or before that date.
07
Period Expected Today (1 day late)
When today is past the predicted next period start by one day. Plural late copy adds the number of days late in parentheses.
Cycle day, phase assignment, and ring interactions are covered in sibling articles—not repeated here.
When predictions cannot be calculated
- Cycle information is unavailable — the ring center message when phase is unknown or the next event cannot be determined for the selected date.
- when your period starts — fallback copy when cycle day or cycle length is not yet available to compute a countdown.
- Restore estimates — log period starts from onboarding, Track Period, or Health import so the app can anchor length and show Next Ovulation or Next Period lines again.
What your logs change
- New period start — logging bleeding resets Day 1, refreshes cycle length averages, and restarts ovulation and period countdowns.
- Completed cycles — when a cycle ends with a logged period, your personal average updates and shapes future predictions.
- Late tracking — the late Expected Today variants compare today to the predicted next period start until you log the actual start.