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Logging flow

Pick today’s flow: none, spotting, light, medium or heavy. One tap.

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What starts a cycle

Cycle day 1 is your first day of full flow — light, medium or heavy.
Spotting does not start a cycle. Spotting in the days before a period belongs to the cycle that is ending, not the one beginning. It is recorded, it tints the calendar, but it does not become day 1.Spotting after full flow, as a period tails off, does count as part of the period under way.

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The cycle card

Shows your current cycle day and phase — menstrual, follicular, ovulation, early luteal, late luteal, premenstrual. Phases are estimated from a 28-day cycle until you have logged enough for the app to learn your own length, then from yours.

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Correcting cycle day 1

This is the important part, and it solves a real problem. Suppose your period started on the 1st, but you only remembered to log it on the 3rd. The app has no way to know, so it makes the 3rd day 1 — and every figure after that is two days out.
1

Tap the cycle day card

The one showing “Cycle day 4” with a small pencil beside it.
2

Pick the day your period actually started

A calendar opens, titled Choose your Cycle day 1.
3

The calendar renumbers

Immediately, from the day you chose.
4

Fill in the days you missed, if you like

Tap any day in the calendar to record its flow.
Why backdating alone did not fix this. Logging the 1st after the fact leaves a gap on the 2nd, and an unlogged day breaks the run — so the app saw two short periods rather than one, and still treated the later one as day 1.Stating your day 1 outright overrides that. It is a fact you know and the log does not.

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Backdating

The “Another day” option logs flow for a past day. Combined with the correction above, you can reconstruct a cycle you started recording late.

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What it does not do

The Period screen is a logging tool, not a calendar app. It shows the current cycle; it does not let you browse back through previous ones. That is deliberate — proper cycle visualisation belongs in the consumer app, where it can be built on a real calendar rather than squeezed into a logging drawer.