Why can a prediction change?
Adding a past period or correcting a date changes the history available to the cycle engine. A shorter or longer recent cycle can also affect the estimate. With very little history, a prediction relies more on your typical-cycle settings; a longer personal record provides more context. Confidence labels communicate uncertainty rather than promise accuracy. Illness, stress, life stages and other circumstances can affect cycle timing, and the app cannot determine which explanation applies to you.
What should I not use predictions for?
Calendar estimates cannot confirm ovulation or pregnancy and should not be used as a contraceptive method. Optional body-sign entries may adjust the app’s estimate, but they remain an estimate rather than clinical confirmation. Irregular-cycle and perimenopause options show wider windows to avoid false precision. If a change concerns you, use your recorded dates to describe it to a qualified clinician instead of relying on a countdown to answer a health question.
How can I use this at my own pace?
Start with the information you already know and keep the rest optional. Your record does not need to be complete to be useful, and a missing entry should not be treated as evidence that nothing happened. Review your calendar and settings when something looks different from what you intended. Before sharing, choose the smallest view that serves the relationship and check its preview. You can change permissions, pause a connection or stop using an optional module. If a feature raises a health question, take the recorded facts to a qualified professional rather than asking the app to make a diagnosis.
What should I check before continuing?
Check that the dates and choices on your screen reflect what you meant to record. A useful next step is to explore the related feature pages below, then decide whether the simple version is sufficient or an optional setting would help. You never need to turn on every module to use Synced well. For questions about privacy, read the full policies rather than relying on a short feature description. If you want help with an app problem, the Contact page explains what to send without including passwords or private health records.
Questions you might have
Why can a prediction change?
Adding a past period or correcting a date changes the history available to the cycle engine.
Does this diagnose a condition?
No. Synced organizes your recorded information and estimates; it does not replace individual medical care.
Can I change what I share?
Yes. Each connection has its own permissions, and you can pause or revoke access. Previously saved information cannot be retrieved.