Period Tracker know when your next period is due
1When did your last period start?
Tap the first day of bleeding. Tap another day to change it.
2Your usual pattern
Saved only in this browser, never sent to us.
Tap the first day of your last period
You will see when your next period is due, your fertile days and a picture of your whole cycle.
ExampleYour next period
Fri 13 Nov
in 18 days · you are on day 11 of 28
- Fertile days
- 25 – 30 Oct
- Likely ovulation
- Fri 30 Oct
- The period after
- Fri 11 Dec
Your cycle at a glance
Your whole cycle, in one picture
- Your periodDays 1 to 516 – 20 Oct
- Fertile daysDays 10 to 1425 – 29 Oct
- Likely ovulationDay 1530 Oct
- Next period startsDay 2913 Nov
Your next three periods
- Fri 13 Novin 18 daysFertile days after it: 22 – 27 Nov
- Fri 11 Decin 46 daysFertile days after it: 20 – 25 Dec
- Fri 8 Janin 74 daysFertile days after it: 17 – 22 Jan
The four phases
What your body is doing, week by week
Your hormones follow the same pattern every cycle. Knowing where you are explains a lot about how you feel.
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You are here
Days 1 to 5
Period A fresh start
- In your body
- The lining of the womb is shed, and a new cycle begins.
- You may feel
- Energy can dip, and cramps are common in the first days.
- Try this
- Warmth, rest and gentle movement help. Iron rich food makes up for what you lose.
-
You are here
Days 6 to 13
Follicular Energy builds up
- In your body
- Oestrogen climbs as an egg ripens in the ovary.
- You may feel
- Many people feel brighter, more social and full of energy.
- Try this
- A good time for harder workouts and new plans.
-
You are here
Days 14 to 16
Ovulation Your most fertile days
- In your body
- An egg is released and lives for about a day.
- You may feel
- Some notice a twinge low on one side, or clear, stretchy discharge.
- Try this
- Trying for a baby? These are your best days. Not trying? Be most careful now.
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You are here
Days 17 to 28
Luteal Winding down
- In your body
- Progesterone rises to ready the lining for a pregnancy.
- You may feel
- In the last days you may feel bloated, tired or low.
- Try this
- Be gentle with yourself: sleep, less salt and caffeine, and a walk all ease premenstrual symptoms.
Your history
Your periods so far
Your period comes about every 28 days, and your cycles are regular.
Average28 days
Shortest27 days
Longest30 days
- A cycle is the days from the start of one period to the start of the next.
- Most cycles last 24 to 38 days, the green band on the right.
- Tapped a wrong day? Remove it with the cross on its row.
Tap the day your last period started, at the top of the page, and your cycles appear here.
Learning your cycle
-
13 Novexpected
28 days
Expected -
16 Octto today
Day 11
Now -
18 Septo 16 Oct
28 days
Usual -
19 Augto 18 Sep
30 days
Usual -
23 Julto 19 Aug
27 days
Usual
Is my cycle normal?
Every body is different. These are the usual ranges.
From the international guidance doctors use (FIGO). Outside a range is not a diagnosis, just a good reason to talk to someone.
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Cycle length
From the first day of one period to the first day of the next.
Not yet
-
How much it varies
The gap between your shortest and your longest cycle.
Not yet
-
Period length
How many days you bleed each time.
Not yet
When to see a doctor
Your period is telling you something. It is worth listening.
No period for three months
And you know you are not pregnant.
Cycles under 24 or over 38 days
Or a pattern that suddenly changes.
Periods lasting more than 8 days
Or bleeding between periods or after sex.
Very heavy bleeding
Changing protection every hour or two, or clots bigger than a coin.
Pain that stops your day
Pain killers do not help, or it is getting worse.
Trying for a baby
For a year without success, or six months if you are 35 or over.
Questions
What people ask about their periods
What is a normal cycle length?
Anything from 24 to 38 days is usual for adults, counted from the first day of one period to the first day of the next. Only a small share of people have exactly 28 days.
How does the tracker predict my next period?
It adds your cycle length to the day your last period started. You can set the cycle length yourself; once you add an earlier period, it fills in the average of your last six cycles for you, and you can still change it.
How many periods should I log?
Start with your last one. Add earlier periods with "Add an earlier period" under the calendar: two give a first cycle length, and three to six give a much better average and show how much your cycle varies.
Is it normal for my cycle to change?
A few days either way is normal. Stress, illness, travel, weight change and some medicines can all shift a period. A difference of more than 9 days between your shortest and longest cycle is worth mentioning to a doctor.
Can I use it to avoid pregnancy?
No. The fertile days are estimates from past cycles and ovulation can move, so this is not a method of contraception.
Can I use it to get pregnant?
Yes, as a guide: the fertile window shows the days sex is most likely to lead to pregnancy. An ovulation test can confirm the day.
Where are my periods saved?
Only in this browser on this device. Nothing is sent to us. Use Forget all to clear them, and print the summary if you want to take it to your doctor.
When should I see a doctor about my periods?
If your cycles are shorter than 24 or longer than 38 days, if a period lasts more than 8 days, if bleeding is very heavy or painful, or if you have had no period for three months.
Your cycle is yours to understand. We are here whenever you have a question.