What is the best first signal?
A period start is best, but bleeding today or period ended can still start a useful learning row.
Practical guide
How to know when her period is coming
The simplest useful method is to save the last clear signal, keep it as a dated anchor, and update the forecast when she mentions a new one.
Try the methodNo spreadsheet mathNo fake exact datesQuick updates after new signals
Start with one signal
How it works
Turn the method into a row
Start with the latest signal and see what a dashboard row would show.
- Save the last period signal
- Use a window, not a single date
- Revise when a new signal arrives
Product proof
A real dashboard, not a 28-day guess.
Roostercal turns one sparse signal into a row you can act on: next window, fertile window, confidence, quick logging, reminders, and calendar export.
Open the dashboardChickNowNext periodMove
BealutealJul 14-18Reduce friction
Quick logBleedingStartedLateNote
Reminder plan2-day heads-up, expected start, late check-in
Export .icsUse cases
Built for the real sparse-data workflow
- Plan gentler dates
- Remember timing
- Know when the estimate is weak
Pricing
One row free. More with Pro.
Free saves one active row and includes data export. Pro is $7/mo or $49/yr for additional rows, automatic check-ins, a live calendar, weekly planning, and forecast history.
Start freeFAQ
Practical answers
What if she is late?
Log it as a late signal and treat the output as a prompt to check in, not as a diagnosis.