The Cycella blog
Well-researched answers to the questions women ask about periods, cycles and health, each one citing sources like WHO, ACOG, NHS or NICHD.
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Irregular cycles: what's normal, and when to see a doctor
How to tell an ordinary irregular cycle from one that's worth a doctor's visit, and what to track before your appointment.
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The fertile window: what it is, and why it isn't a contraception method
How the fertile window is calculated, why it's only an estimate, and why it shouldn't be relied on alone to avoid pregnancy.
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First periods: what to expect, and what's normal
What to expect from a first period and the irregular years that follow, plus signs it's worth seeing a doctor.
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Pads, cups and period hygiene: a practical guide
How pads, tampons and menstrual cups work, and the hygiene habits that apply no matter which you choose.
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Period pain: what's normal, and when it isn't
How to tell ordinary period cramps from pain that's worth a doctor's attention, and what to track in between.
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PMS, PMDD and your mood: what's happening, and what helps
The difference between ordinary premenstrual mood changes and PMDD, and why tracking mood against your cycle helps either way.
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Tracking your cycle in three taps, and why it helps at the doctor
Why lightweight, consistent cycle tracking beats memory, and how it pays off in a real doctor's appointment.
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PCOS basics: what polycystic ovary syndrome is, and isn't
A plain-English introduction to PCOS: what it is, common signs, how it's diagnosed, and why cycle tracking helps.
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Does Your Period Tracker Sell Your Data? What to Check Before You Download One
Period and cycle data is sensitive health information. Here's what US regulators and independent privacy researchers have found about popular period tracker apps, and what to look for before you trust one.