Starting Cycle Tracking
Start where it's easy.
How to begin tracking your cycle, from thirty seconds a day to as far as you ever want to take it.
A friend asked me over dinner how she should start tracking her cycle, and I opened my mouth to answer and realised I was about to overwhelm her.
Because that's the reflex, isn't it. Someone shows a flicker of interest and you want to hand them everything at once. The thermometer, the mucus observations, the apps, the charts, the whole apparatus. And I watched her interest start to close like a shop shutter, because what I was describing sounded like a second job, and she already has a first one.
So I stopped. And I said: okay, forget all of that. Here is the only thing you have to do to start. And it fit in one sentence.
This post is that sentence, and then everything that comes after it, arranged so you can climb exactly as far as you want and no further. You are allowed to stop at step one. Step one is already worth doing.
The first step, and why it's this one
Here is the whole of it. Once a day, when you brush your teeth at night, write down one word about how you felt today. That's it. That is the entire first step.
Every night, while you're brushing your teeth, note one thing about your day. A mood, a symptom, an energy level. Tired. Wired. Crampy. Great. Anxious. Bloated. Flat. Strong. One word is enough. Write it wherever you'll see it, the notes app, a paper diary, whatever app you already have open most.
You are not analysing anything yet. You're just collecting. The pattern comes later, and it comes for free.
Two things make this work, and both of them are borrowed from how habits actually form rather than how we wish they'd form.
The first is that it's attached to something you already do without fail. This is habit stacking, the idea from behaviour research that the easiest way to build a new habit is to anchor it to an existing one, so the old habit becomes the cue for the new one.1 You already brush your teeth every night. You don't negotiate with yourself about it. Bolting a thirty-second note onto the end of that means you don't need willpower or a reminder, you just need the toothbrush you were reaching for anyway.
The second is that it's small enough to be almost embarrassing. That's deliberate. The reason most cycle-tracking attempts die is not that women aren't disciplined, it's that the first version was too big, and a too-big habit collapses the first busy week. One word cannot collapse. There is no day so bad you can't manage one word. And a habit that survives beats an elaborate one that doesn't, every single time.
Give it two cycles. Sixty-ish days. Then do the one thing that turns a list of words into information: put your notes next to your period dates and read down the column. Most women see it almost immediately, the same words landing in the same stretch of the month. The flat, teary days clustering before the bleed. The good, sharp, capable days in a different week. You didn't analyse anything. You just wrote a word a night, and the pattern assembled itself while you weren't looking.
That recognition, oh, this repeats, this is not random, this is me on a schedule, is the actual point of cycle tracking. Everything past here is refinement.
If you want to go further
Say the one-word habit stuck, the pattern showed up, and now you're curious. Good. Here are the tiers, in the order I'd add them, each one a little more effort and a little richer in what it hands back.
- Tier one: mark the calendar properly. Barely more effort than the word. Each day, note whether you're bleeding and roughly how heavy, plus your one word. Now you're capturing cycle length, period length, and the shape of your symptoms across it. Any free period app does this, or a paper diary if you'd rather keep it off your phone. This alone tells you if your cycles are regular, how long your luteal phase runs, and whether anything's shifting month to month. For a lot of women this tier is the whole destination, and that's completely fine.
- Tier two: add cervical mucus. This is the step that surprises people, because nobody taught us to look. Your cervical mucus changes across the cycle in a readable way, dry after your period, then creamy, then, around your fertile window, clear and stretchy, like raw egg white. Noticing it takes seconds in the bathroom and needs no equipment at all. It's one of the more informative low-tech signals you have, and it points to your fertile window as it's approaching rather than after.2
- Tier three: basal body temperature. Here you add a small piece of kit, a basal thermometer that reads to two decimals, about ten euros. You take your temperature first thing on waking, before you sit up, at roughly the same time each day, and log it. The reason it's worth it: after ovulation, progesterone nudges your resting temperature up by around 0.3 to 0.6 degrees Celsius, and it stays up until your period.3 Chart it across a cycle and you get a two-level pattern, lower before ovulation, higher after, that confirms ovulation actually happened. One caveat worth knowing going in: temperature confirms ovulation after the fact, it doesn't predict it, and readings get thrown off by poor sleep, alcohol, and illness.3 Pair it with the mucus and you're doing a real fertility-awareness method: mucus tells you it's coming, temperature confirms it came.
- Tier four: let a wearable carry the effort. If the daily thermometer feels like friction, a temperature-sensing ring or wearable measures your skin temperature overnight while you sleep and syncs it in the morning, no waking ritual required. You trade a little money and some data-privacy consideration for a lot less daily effort, and you get continuous overnight temperature trends that a single morning reading can't match. Worth checking the privacy policy of anything you hand your cycle data to, since not all of them treat it the way you'd want.
- Tier five: test the hormones directly. The deepest tier, and the one to approach with the most care. At-home ovulation strips read the LH surge in urine and flag ovulation a day or so before it happens, useful alongside everything above. Beyond that sit proper hormone panels, blood or dried-urine tests that measure estrogen, progesterone, and more across the cycle. These give you the actual numbers underneath everything the other tiers infer. They also cost real money and, more importantly, are worth interpreting with a clinician rather than alone, because a number without context is easy to misread. This tier is genuinely valuable when there's a specific question to answer. It is not where a beginner needs to start, and it's not more virtuous than the toothbrush word. It's just further along the same road.
You should not have had to go looking for this
Here is the part that quietly annoys me. Half of the population menstruates for something like four decades of life, and almost none of us were ever taught that the cycle is trackable, readable, informative, a stream of data about our own bodies running the whole time. We were taught to manage the period and hide the evidence. The tracking, the part that turns the cycle from a monthly inconvenience into a source of genuine self-knowledge, we mostly find on our own, late, usually because something went wrong or a friend mentioned it over dinner.
And the information is not obscure. Cervical mucus patterns and the post-ovulation temperature shift have been documented for decades and used in fertility-awareness methods for just as long. This is not frontier science. It's basic female physiology that simply never made it into the education most of us got, which means women rediscover it one by one, in their thirties, slightly annoyed that nobody said so sooner.
So if you're starting now, you're not behind. There was no starting line anyone showed you. You're just starting, which is the only thing that was ever actually required.
What you'll actually start to feel across a month
One thing that helps enormously when you begin is knowing what you're even looking for. So here is a rough field guide to the four phases, not as rules, because bodies vary and yours is the authority, but as a starting map you can hold your own notes up against.
Notice how much of that you could catch with nothing but a nightly word. The heavy day, the sudden energy, the stretch of low patience before the bleed. You don't need the ring or the panel to feel the shape of your month. You need to be paying a little attention, on a schedule you'll actually keep.
My friend, for the record, did start. Not with any of the equipment I'd been about to bury her under. She started with the word by the toothbrush, because that was the version small enough to survive contact with her actual life.
And that's the whole thing I'd want you to take, if you take one thing. The best tracking method is not the most sophisticated one. It's the one you'll still be doing in three months. Start absurdly small, let the pattern show you it was worth it, and climb only when climbing feels like curiosity rather than obligation.
One word, by the sink, tonight. That's the start. Everything else is optional, and it will still be here when you're ready for it.
Once the pattern shows up, the natural next question is what it all means, why the energy lifts when it does, why the week before is what it is. That's a good deal of what The Art of Female Health walks through, phase by phase, if you want the reading that sits underneath the tracking.
- Gardner, B., Lally, P., & Wardle, J. (2012). Making health habitual: the psychology of habit-formation and general practice. British Journal of General Practice, 62(605), 664–666. doi:10.3399/bjgp12X659466
- Cleveland Clinic (reviewed). Cervical mucus and fertility awareness: what the changes across the cycle indicate. clevelandclinic.org
- Steward, K., & Raja, A. (2023). Physiology, Ovulation and Basal Body Temperature. StatPearls. NCBI Bookshelf. ncbi.nlm.nih.gov/books/NBK546686