Cycella BlogResearched articles on periods, cycle health and using Cycella.https://cycella.com/Irregular cycles: what's normal, and when to see a doctorhttps://cycella.com/blog/irregular-cycles-when-to-see-a-doctor/https://cycella.com/blog/irregular-cycles-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.Sun, 27 Sep 2026 00:00:00 GMTThe fertile window: what it is, and why it isn't a contraception methodhttps://cycella.com/blog/fertile-window-not-contraception/https://cycella.com/blog/fertile-window-not-contraception/How the fertile window is calculated, why it's only an estimate, and why it shouldn't be relied on alone to avoid pregnancy.Sun, 27 Sep 2026 00:00:00 GMTFirst periods: what to expect, and what's normalhttps://cycella.com/blog/first-periods-what-is-normal/https://cycella.com/blog/first-periods-what-is-normal/What to expect from a first period and the irregular years that follow, plus signs it's worth seeing a doctor.Sun, 27 Sep 2026 00:00:00 GMTPads, cups and period hygiene: a practical guidehttps://cycella.com/blog/pads-cups-period-hygiene/https://cycella.com/blog/pads-cups-period-hygiene/How pads, tampons and menstrual cups work, and the hygiene habits that apply no matter which you choose.Sun, 27 Sep 2026 00:00:00 GMTPeriod pain: what's normal, and when it isn'thttps://cycella.com/blog/period-pain-normal-or-not/https://cycella.com/blog/period-pain-normal-or-not/How to tell ordinary period cramps from pain that's worth a doctor's attention, and what to track in between.Sun, 27 Sep 2026 00:00:00 GMTPMS, PMDD and your mood: what's happening, and what helpshttps://cycella.com/blog/pms-pmdd-and-mood/https://cycella.com/blog/pms-pmdd-and-mood/The difference between ordinary premenstrual mood changes and PMDD, and why tracking mood against your cycle helps either way.Sun, 27 Sep 2026 00:00:00 GMTTracking your cycle in three taps, and why it helps at the doctorhttps://cycella.com/blog/tracking-in-three-taps/https://cycella.com/blog/tracking-in-three-taps/Why lightweight, consistent cycle tracking beats memory, and how it pays off in a real doctor's appointment.Sun, 27 Sep 2026 00:00:00 GMTPCOS basics: what polycystic ovary syndrome is, and isn'thttps://cycella.com/blog/pcos-basics/https://cycella.com/blog/pcos-basics/A plain-English introduction to PCOS: what it is, common signs, how it's diagnosed, and why cycle tracking helps.Sun, 27 Sep 2026 00:00:00 GMTDoes Your Period Tracker Sell Your Data? What to Check Before You Download Onehttps://cycella.com/blog/period-tracker-privacy-what-to-check/https://cycella.com/blog/period-tracker-privacy-what-to-check/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.Sun, 27 Sep 2026 00:00:00 GMT