A period tracker you can write to in your own words
When you want to know where you are in your cycle, you can ask Portal One in your private chat, in Telegram or on the web. Portal works as an AI period tracker: you write when a period started or ended, and Portal keeps an encrypted cycle log and estimates when the next one is likely.
The tracker is not yet in every Portal: if yours does not have it, write in your private chat that you want to track your period, and Portal adds the tracker and asks before keeping anything.
The estimate comes from your own logged cycles, so a cycle shorter or longer than 28 days is counted as it is. The estimate helps you plan a trip, a demanding week or an appointment, and it is neither a medical result nor birth control.
How the log works in the chat
- Ask Portal for the trackerIf your Portal does not have the period tracker yet, write in your private chat that you want to track your period, and Portal adds the tracker. The tracker works only in your private chat with Portal, in Telegram or on the web, never in a group chat.
- Tell Portal when a period starts or endsWrite it in your own words, on the day or later: “started yesterday” or “ended on Sunday” is enough. The first time, Portal asks whether you want Portal to keep a cycle log, and nothing is saved until you say yes; after that, Portal records each date you give it.
- Add more than dates, if you wantBesides the start and end of a period, you can tell Portal how a day went (flow, cramps, mood, pain, temperature, a note), a pill taken or missed, a test and its result, or sex and the protection used, and Portal keeps it in the same log. Portal is set never to bring up your sex life, a partner or a test unless your question opens the subject.
- The forecast comes from your own cyclesPortal looks at your last six logged cycles, never a 28-day template, and gives the next period as a span of days. With one period logged, Portal knows only the cycle day; the forecast starts after the second period, or at once if you state your usual cycle length.
- Ask what you want to knowYou can ask which cycle day it is, which phase you are probably in or when the next period is likely. If the log is too old to say anything about today, Portal says so instead of guessing.
- Correct or remove an entryWhen a date is wrong, tell Portal in the chat: Portal can change a start, remove one entry or clear a detail you logged by mistake. A start logged fewer than 15 days after the previous one is saved, and Portal asks whether it was a period or spotting.
What the numbers mean
| Next period | Portal takes the middle value (the median) of your last six logged cycles as the expected day and shows a span around it of half the gap between your shortest and longest cycle on each side, at least 1 and at most 7 days. With one logged cycle the span is 3 days on each side, with a cycle length you stated it is 2, and a gap under 15 or over 60 days between two starts is not counted as a cycle. |
|---|---|
| Cycle day and phase | Day 1 is the first day of a period. From your last logged start, Portal counts the cycle day and names the phase you are probably in: menstrual, follicular, fertile days, ovulation, luteal, or late when the period has not come by the end of its span. |
| Ovulation and fertile days | Portal estimates ovulation 14 days before the next expected period and the fertile days from 5 days before ovulation to 1 day after, widened by your shortest and longest cycles once three are logged. The estimate is always labelled as one; ovulation shifts from cycle to cycle, so the estimate is not a contraceptive method and no day is ever called safe. |
| A late period | A period is called late only after the last day of its span, and the days late are counted from the expected day. When a period is late and your log has sex in it, Portal tells you from which date a home pregnancy test is reliable. |
| When your cycles vary | Portal widens the span instead of naming one date. If the expected day is more than 45 days behind and no new period is logged, Portal says the log is out of date and gives no forecast. |
| Contraception, pregnancy, menopause | Once you tell Portal you use the pill, patch, ring, implant, injection or a hormonal IUD, Portal stops estimating ovulation and fertile days and keeps the period forecast. If you tell Portal you are pregnant, after birth or past menopause, Portal pauses the forecast too, and Portal never guesses any of these from your log. |
| Reminders | Portal sends no reminders unless you ask: after two logged periods Portal may offer once to remind you the morning before your next period is likely, and one word from you stops the reminder. |
| Temperature | Portal keeps the temperatures you log, but the forecast does not use them. |
What the tracker is not
- Not birth control. Any ovulation or fertile-day figure is an estimate, and no day is ever called safe for sex without contraception.
- Not a diagnosis. Portal is an AI, not a doctor: Portal can describe what your log shows, but does not name a condition or suggest a dose.
- Not a medical device, and the forecast is not a medical result.
- An AI can be wrong. Check a date that matters against your own records, and correct Portal in the chat when a date is off.
When to see a clinician
- Bleeding between periods, after sex, or after menopause.
- Bleeding that soaks through a pad or tampon every hour, or a period that lasts more than 7 days; Portal itself points this out once bleeding passes day 8.
- Cycles shorter than 21 days or longer than 35 days.
- No period for 3 to 6 months, or 3 missed periods in a row with a negative pregnancy test.
- Heavy bleeding that needs a new pad or tampon every hour for more than 2 hours, together with chest pain, shortness of breath and dizziness: this needs emergency care right away.
What happens to your cycle data
Each entry in your cycle log is stored in Portal's database encrypted with AES-256-GCM under a key used only for cycle logs, so a copy of the database shows that an account has entries and when they were written, but no date, symptom or word. What you write in the chat, and the entries Portal reads to answer you, go to the model providers that write the replies, and the service as a whole is not end-to-end encrypted. Once your Portal has opened your cycle log, the text of your messages is kept out of product analytics; in Telegram, your first message on the subject can still reach analytics before that.
Through the product, only your own Portal in your private chat reads your log: there is no sharing with a partner or anyone else, and a person at Portal can read a log only with both database access and the cycle log key.
Portal is told never to copy your cycle entries into Portal's memory notes; a fact you mention in conversation can still be remembered, and you can remove it on your account's Memory page.
Your cycle log is not on the account page: in the chat, ask Portal to export it, to remove one entry, or to erase all of it; before erasing all of it, Portal confirms once and then deletes every entry in one step, and deleting your account erases the log too. The log has no automatic expiry, database backups keep a sealed copy of erased entries until their own retention ends.
If you tell Portal to stop keeping the log, nothing new is saved and the entries you have stay until you erase them.
Questions
Is there a period tracker in Telegram?
Yes. Portal One works in Telegram and in the web chat at portal.ai. You write the dates in your private chat with Portal, and Portal keeps them in a separate encrypted log, not in the chat history; the tracker does not work in a group chat.
How do I get the period tracker in Portal?
The tracker is not yet in every Portal. If yours does not have it, write in your private chat that you want to track your period, and Portal adds the tracker; the first time you give a date, Portal asks whether to keep a cycle log, and nothing is saved until you say yes.
How does an AI assistant track a period?
You tell Portal in ordinary words when a period starts or ends, and once you agree to a log, Portal saves those as dates. Portal counts the cycle day and takes the median of your last six logged cycles as the expected day of the next period, with a span of days around it.
How accurate is the forecast?
That depends on how regular your cycles are and how many are logged. With several similar cycles the span is narrow; when cycle lengths differ a lot, or only one cycle is logged, the span is wider. Stress, illness, travel and a change of contraception can move a period outside any forecast.
Can I use the forecast to avoid pregnancy?
No. The ovulation and fertile-day figures are calendar estimates for awareness, and this calendar estimate is not a contraceptive method. Some cycle-tracking software is sold as a method of contraception and is cleared for that use; Portal is not that kind of product. For contraception, talk to a clinician about a method that suits you.
What happens to my cycle data?
Each entry in your cycle log is stored encrypted with AES-256-GCM under a key used only for cycle logs. What you write in the chat, and the entries Portal reads to answer you, go to the model providers that write the replies; the service as a whole is not end-to-end encrypted. In the chat you can ask Portal to export the log, remove one entry or erase all of it; the log is not on the account page, and deleting your account erases it too.
Does Portal remind me before my period?
Only if you ask. After two logged periods Portal may offer once to remind you the morning before your next period is likely; the reminder is about the period only, and one word from you stops it.
Does Portal replace a period app or a doctor?
If writing in a chat suits you better than tapping dates into a separate cycle tracker, Portal can take the place of that app. Portal does not replace a doctor: for the signs in the clinician list on this page, or anything that worries you, see a clinician, and Portal can put the last months of your log into a short summary to show there.
Sources
- NHS, Periods,
- NHS, Periods and fertility in the menstrual cycle,
- ACOG, Abnormal Uterine Bleeding,
- U.S. Food and Drug Administration, Birth Control,
Written by the Portal AI team as general information; this page is not medical advice. Last updated:
Ask Portal for the period tracker
Open Portal One and say you want to track your period; Portal adds the tracker and asks before keeping anything. Portal One comes with a free 3-day trial, then a subscription, and the prices are on portal.ai/pricing.