Redefining menstrual and reproductive health, one period at a time.
Subscribe to our newsletter to get science-backed articles, app tips, and the latest updates from Clue.
Featured
About Clue
Patient Data Privacy at Clue: A statement from the Co-CEOs
We do not sell your health data, we protect it and we will not disclose it
by Carrie Walter, and Audrey Tsang
Most Popular
Fertility
Can I get pregnant from that?
There are lots of myths and misconceptions about how pregnancy happens.
by Jen Bell
Non-Hormonal Birth Control
Is Clue Birth Control the right contraception for me?
First things first, Clue Birth Control isn't a pill or an implant. It's a software application for contraception that uses...
Pregnancy, Birth & Postpartum
How is your due date calculated?
Your “due date,” also called your estimated date of delivery (EDD), is based on your menstrual cycle.
Endometriosis
Endometriosis 101
Endometriosis is a leading cause of pelvic pain, and painful sex—up to 1 in 10 women of reproductive age may...
by Anna Druet
Browse articles by categories
Menstrual Cycle
Everything you need to know about your cycle and how it works, from A to Z.
Go to topic page
Menstrual Cycle
What is the menstrual cycle?
Understanding the cycle is important for your overall health. We break down the phases and hormones of the menstrual cycle.
Menstrual Cycle
What is an “irregular” menstrual cycle?
Some variability in your cycle length is normal.
by Anna Druet
Menstrual Cycle
Do periods sync?
Lesbian, queer and trans couples respond to our research on menstrual syncing
by Jen Bell
Birth Control
How effective is birth control?: The difference between using a method perfectly and typically
Researchers measure how well a birth control method works in two ways: perfect-use and typical-use.
Birth Control
Birth control and sex drive
Whether you’re using birth control or not, you can use Clue to track both your sexual frequency and sex drive.
Birth Control
Birth control and weight gain
Many people believe that hormonal birth control causes weight gain, but the research is not so clear cut. Here's how...
Birth Control
When is emergency contraception most effective?
There is a lot of confusion around the use and effectiveness of emergency contraception.
Birth Control
Emergency contraception: more than just the morning-after pill
If you had unprotected vaginal sex, you could become pregnant. You have up to five days after unprotected sex to...
Birth Control
Bleeding on the IUD
IUDs can have different effects on your period quality and quantity.
Birth Control
How to track your body's changes when going on or off birth control
If you’ve ever started or stopped taking hormonal birth control, your body may have experienced side effects. Tracking changes in...
Birth Control
My IUD insertion: a kind-of boring story
When it works out just fine, we don't often hear about it.
Birth Control
How do IUDs prevent pregnancy?
What the latest research says about how the hormonal IUD and the copper IUD work.
Birth Control
What it’s like to use the morning-after pill
We reached out seeking your experiences with the emergency contraceptive pill. Here’s what came in.
by Jen Bell
Birth Control
IUD myths and misconceptions
Is it painful to have an IUD inserted? Can an IUD get lost inside of me? Your questions about...
Fertility
Ovulation: What is it, and how do I know when I'm ovulating?
It is helpful to know about ovulation even if you aren't trying to get pregnant.
by Anna Druet
Fertility
Basal Body Temperature (BBT): how is it used to estimate ovulation?
Your reproductive hormones have a measurable impact on your temperature.
Fertility
Pregnancy tests: when and how to take a pregnancy test
Here's everything you need to know about pregnancy tests.
Fertility
Can I get pregnant from that?
There are lots of myths and misconceptions about how pregnancy happens.
by Jen Bell
Fertility
What you may not know about ovulation: common questions and misconceptions
The monthly release of an egg from the ovary is a fascinating process.
Issues & Conditions
Disabled people have periods, too
Women and people with cycles can face barriers to adequate healthcare, and having a disability can add another layer of...
Issues & Conditions
The immune system and the menstrual cycle
During the follicular phase of the menstrual cycle, people tend to have higher levels of antibodies.
Issues & Conditions
Toxic Shock Syndrome (TSS) and menstrual products: a short history
You may have heard about TSS, and know that it has something to do with tampons. Fortunately, it’s rare.
Sex
Sex is an important part of the human experience. It can still be taboo to talk about, but here you'll...
Go to topic page
Sex
Condom use from a female perspective: Clue’s study with KI-CURT
Clue polled 95,000 people from 200 countries on condom use and menstruation
Life & Culture
Internationally inclusive: keeping Clue gender-neutral in several languages
Gender-inclusivity is an important part of what we do at Clue. We asked our translators: “What does it mean to...
by Jen Bell
Life & Culture
How to talk about menstruation
Ever wanted to talk to someone about your period but didn't know how? Now's the time.
Life & Culture
How to advocate for yourself at the doctor
Here’s what to do before, during and after your visit, to get the best healthcare possible.
by Jen Bell
Track your period and understand your body better. Get the app:
App Store
Play StoreAbout Clue
Clue is a menstrual tracking app, an encyclopedia, a resource for your health, and more. Here are all the posts...
Go to topic page
About Clue
Clue's response to Roe vs Wade
While we navigate this new reality, we promise to squarely face the challenges it brings, to listen and do everything...
About Clue
The journey of a single data point
It's our job to keep everything you track in Clue safe.
by Ida Tin
About Clue
The journey of a single data point, Part II: About the selling of health data
We never have and we never will.
by Ida Tin
About Clue
Patient Data Privacy at Clue: A statement from the Co-CEOs
We do not sell your health data, we protect it and we will not disclose it
by Carrie Walter, and Audrey Tsang
About Clue
Learn more about your body with Clue Plus
When you subscribe to Clue Plus, you don't only get new features: you also fund important research, support data privacy,...
About Clue
How Clue is beating stress at work
Clue supports over 12 million people with their menstrual health — including Clue employees. To keep Clue employees healthy and...
About Clue
5 unexpected benefits of period tracking
Clue co-founder Ida Tin shares her top 5 reasons to track your period.
by Ida Tin
About Clue
Bringing awareness to infertility: how tracking your period can help
In recognition of #NIAW2021, and the people with periods and their partners who experience infertility, we hosted a webinar with...
About Clue
Introducing Clue’s first-ever Chief Medical Officer, Dr. Lynae Brayboy
Clue's new Chief Medical Officer will help Clue evolve into the go-to source for women and people with cycles at...
by Aubrey Bryan
About Clue
Clue Birth Control, our FDA-cleared digital contraceptive is (almost) here
We’ve got some exciting news: Clue Birth Control is now available to an initial group of people in the USA....
About Clue
Scientific research at Clue
When you track in Clue, you contribute to an unprecedented data set that is forwarding the understanding of female health.
by Anna Druet
About Clue
Clue’s Editorial Policy
At Clue, we prize openness and transparency—that’s why we’re publishing information about how and why we publish content.
About Clue
Choosing to challenge: New leadership–same powerful vision
I am proud to announce that Carrie Walter, formerly Clue’s General Counsel, and Audrey Tsang, formerly Clue’s Chief Product Officer,...
by Ida Tin
About Clue
What's this? Bayer Sponsored Content
Information about content produced by Clue and sponsored by Bayer.
About Clue
“Alternative” approaches to health: How we think about health information at Clue
We sometimes get emails asking why we collaborate with naturopaths for our online content. It's a fair question.
About Clue
Why we’re proud to work at Clue
For this Pride month, we wanted to take a moment to reflect on why some of our employees are proud...
About Clue
A global call for action on the International Day of Action for Women’s Health
We’re joining the UN’s Generation Equality initiative to contribute to the global effort for gender equality.
About Clue
The rise of a new category: Femtech
In 2009, I sat with an old phone in my hand — the kind with a small screen and actual buttons
by Ida Tin
About Clue
10 health facts Clue learned in 2018
Impress your friends and family with these menstrual and reproductive health facts.
About Clue
Diversity, equity and inclusion at the heart of Clue
Diversity, equity and inclusion are not end states. Like all real values, they are living concepts to which we must...
About Clue
Why does it cost so much to build an app, and who pays?
We don't make money from selling your personal health data—we choose the alternative. You can help support us by subscribing...
by Ida Tin
About Clue
The ways apps make money and spend money
Getting an app like Clue up and running is no small feat. Clue's CEO Ida Tin explains what's going on...
by Ida Tin
About Clue
Why we made a website
People deserve a different kind of online resource: a place where menstrual and reproductive health is taken seriously and with...
About Clue
Accessibility guide to the Clue office
Everything you need to know if you’re visiting us in Berlin.
by Jen Bell
About Clue
Clue and UNFPA Brazil sign partnership on reproductive and sexual health
Clue is the only period tracker and menstrual calendar app signatory of the Alliance for Sexual and Reproductive Health and...