The menstrual cycle is more than a date on a calendar. It is a changing biological pattern, and the experience can differ from one person, and one cycle, to the next.

AIVELA Cycle Tracking combines period dates you confirm, your cycle history, and personalized nighttime temperature trends with other suitable physiological information. It helps you understand where you may be in your current cycle, when your next period is expected, and how your own pattern changes over time.

It is designed for body awareness and everyday planning. It is not a fertility, contraception, pregnancy-probability, symptom-prediction, or diagnostic tool.

A cycle record can make a changing month easier to remember

When dates vary, memory alone can be difficult to rely on. Confirmed records give you a clearer history; predicted dates offer an uncertain planning view. Keeping those separate helps you prepare without feeling that your body must follow the App's calendar. Your experience remains important when a date moves.

What Cycle Tracking can show you

When Cycle Tracking has suitable information and is available for your current reproductive and hormone status, it can include:

• your current Cycle Day;
• your current Cycle Phase;
• the expected timing of your next period;
• period start and end logging;
• reminders that ask you to confirm, not assume, whether a period started or ended;
• nighttime temperature trends;
• your typical cycle length, period length, and cycle-to-cycle variation as your confirmed history develops;
• a history of periods you actually recorded.

The Cycle Ring can organize the current cycle into four familiar phases: Period, Follicular, Ovulatory, and Luteal. These are estimated phase views, not a direct measurement of hormone levels.

AIVELA does not display a specific predicted ovulation date in this release. It shows an Ovulatory Phase to support general cycle awareness without turning that estimate into a fertility claim.

Your confirmed period record comes first

Predictions can help you plan, but they never become history by themselves.

Only a period start that you confirm creates a new Cycle Day 1 and a real period record. If an expected date passes and you do not log a period, AIVELA may continue to show an estimated cycle view, clearly identified as prediction-based. It will not silently convert the predicted date into something you reported.

The same principle applies to the end of a period. AIVELA can estimate an end for display and reminder purposes, but only the date you confirm becomes part of your completed period record.

This separation keeps your history honest: confirmed dates are facts you provided; predicted dates remain predictions.

Predictions become more personal over time

You can receive an initial prediction using the recent period and typical cycle information entered during setup. You do not need to wait months before the feature becomes useful.

As you wear AIVELA RING PRO consistently overnight, the system can learn how your temperature pattern relates to your cycle history. Continued period-start logging keeps the prediction anchored to what actually happened. With roughly three months of consistent overnight information, predictions have a stronger opportunity to reflect your individual temperature pattern rather than relying mainly on the initial estimate.

That does not mean every future date becomes fixed. Cycles naturally vary, and illness, travel, stress, schedule changes, medication, and hormonal changes may affect both the body and the available signals. An updated prediction is the system responding to newer information, not rewriting your confirmed past.

Why nighttime skin temperature helps

Hormonal changes across a natural menstrual cycle can be accompanied by a lower temperature pattern during much of the follicular phase and a higher pattern during the luteal phase. AIVELA looks at your temperature trend relative to your own pattern, rather than treating one night's skin temperature as proof of a phase.

Skin temperature is not the same as core temperature or a clinical thermometer reading. It can also change with the environment, illness, alcohol, sleep conditions, and other forms of strain. That is why Cycle Tracking combines temperature with confirmed period history and other suitable information instead of interpreting a single value in isolation.

Why an expected date or phase may change

A prediction is a best estimate based on the information available at that time. It may move when:

• you confirm a new period start or correct an earlier record;
• newer nighttime patterns add useful information;
• the length or timing of recent cycles differs from earlier cycles;
• the ring has not synchronized recent information;
• a prediction becomes too old to support the current view.

Small changes are normal. If the App is using a predicted cycle because no recent start was confirmed, it should label the view as estimated and invite you to log the latest period. If the available prediction range is exhausted, AIVELA does not extend it with a generic calendar guess; it asks you to synchronize the ring or add a confirmed period start.

Hormones and life stages can change what is meaningful

Hormonal contraception, hormone replacement therapy, fertility treatment, pregnancy, and the period after pregnancy can alter or interrupt the patterns Cycle Tracking normally uses.

Depending on the status you select, AIVELA may limit phase-related insights or pause predictions while preserving your cycle history and relevant logging options. This is not a judgment about your health. It prevents the App from presenting a confident phase interpretation when the underlying assumptions may not apply.

Keep your status current in the App. If you prefer not to disclose it, AIVELA may provide a more limited experience rather than guessing.

Important boundaries

AIVELA Cycle Tracking is not intended to:

• identify a fertile window or determine the best time to conceive;
• provide contraception or tell you when unprotected sex is safe;
• confirm ovulation, pregnancy, menopause, or a hormone condition;
• predict symptoms or determine why bleeding changed;
• replace a pregnancy test, hormone test, clinical thermometer, or medical evaluation.

If you experience unusual bleeding, severe pain, a missed period that concerns you, or another persistent change, seek advice from a qualified healthcare professional. Do not wait for the App to confirm that something is wrong.

Cycle Tracking helps you understand your pattern. It does not make reproductive decisions for you.

Related reading

• What Skin Temperature Can, and Cannot, Tell You
• How AIVELA Builds Your Personal Baseline
• Data Quality, Gaps, and Estimated Results