This week we released a special update to Clue. If you take a look at the sex tracking section, you might spot something different: new icons for protected and unprotected sex.

Every day, millions of people track their health using Clue. To give a sense of what 2017 was like for Clue users, we crunched some of the numbers. Happy holidays!

By Maegan Boutot, Science Writer for Clue

Fertility Awareness-Based Methods (FAMs) are tools that people use both to become pregnant and prevent pregnancy (1–4). There are a few different methods, but the goal of all FAMs is to predict when a person will ovulate (1–4).

These methods are based on the facts that (A) a person can only become pregnant if they have unprotected heterosexual sex during the six days leading up to and including ovulation (this is called the fertile window) and (B) people ovulate once per cycle (5). …

Top things to know:

  • Your body’s resting temperature rises slightly during the luteal phase (the second half) of your menstrual cycle
  • Carefully tracking your basal body temperature with a basal body thermometer will help you know when ovulation has occurred, but won’t predict when it will happen in the future
  • Basal body temperature can be used in combination with cervical mucus changes to determine when fertility is highest

Basal body temperature (BBT) is your body’s temperature at rest, like when you first wake up in the morning. Your reproductive hormones have a measurable impact on your temperature (1,2). …

What you need to know about withdrawal (“the pull out method”)

By Maegan Boutot, Science Writer for Clue

The withdrawal method of contraception, also known as “pull-out” method or “coitus interruptus”, is a form of birth control where one partner removes their penis from the other partner’s vagina and away from their partner’s genitals before they ejaculate, which usually happens at or around the time of orgasm. In most healthy individuals, ejaculatory fluid (also known as “cum”) contains enough sperm to potentially get someone pregnant. By withdrawing, sperm should theoretically never reach their partner’s egg and pregnancy is not possible. No sperm, no problem.

Is the pull out method effective?

The withdrawal method is generally not considered…

by Ida Tin, Co-Founder and CEO of Clue

It’s been five years since we founded Clue. I think it’s a good moment to pause and discuss again what role data is playing for users and Clue, and what promise it holds — and also to fully acknowledge the responsibility that comes with being the safekeepers of so much intimate data.

Since we started Clue, millions of people have tapped their screens over a billion times to document what their bodies are telling them. Data about bleeding, of course — Do I have too much blood? Why is my period like…

By Maegan Boutot, Science Writer for Clue

Miscarriage, or the loss of a pregnancy in the first 20 weeks, is a very common experience, especially within the first 13 weeks of a pregnancy (1). At least 1 in 3 pregnancies will end in a miscarriage, though people do not always know that they were pregnant when a miscarriage occurs (1,2). Miscarriages are also most common in the first six weeks of pregnancy (3).

When a miscarriage occurs very early in pregnancy (for example, less than or equal to two weeks after an expected period), it can be difficult to tell…

By Lara Briden, ND

Heavy menstrual bleeding can affect up to 1 in 4 women (1). It’s defined as blood loss of greater than 80 mL or lasting longer than eight days (2). To visualize this, 80 mL equates to 16 fully soaked regular tampons, or eight fully soaked super-tampons over all the days of your period, or repeatedly soaking through a pad or tampon every two hours.

If you experience heavy menstrual bleeding, please see your healthcare provider. They will likely conduct investigations to determine the cause of your heavy bleeding. …

Like uterine polyps, uterine fibroids are a common cause of changes in bleeding and period pattern. While polyps are more likely to develop around the time of menopause, fibroids most often develop during the reproductive years. Here’s how to know if you have fibroids.

Top things to know:

  • Uterine fibroids are abnormal growths of muscle tissue that form in or on the walls of the uterus.
  • Symptoms include irregular bleeding between periods and pelvic pain.
  • Estrogen and progesterone play a role in the growth of fibroids.
  • You might not notice them, but if they become problematic, they are treatable.

What they are

Uterine fibroids are abnormal growths…

If you’re approaching menopause and experience vaginal bleeding outside of your normal pattern, it could be due to a condition called uterine polyps. The good news is if your polyps become problematic, they are treatable. Here’s what you need to know.

Top things to know:

  • Uterine polyps are abnormal growths on the inside lining the uterus
  • They occur most commonly leading up to and after menopause
  • Symptoms include irregular bleeding between periods and periods that vary in length and heaviness

Smaller polyps are often not noticeable, or can go away on their own, but problematic polyps can be treated with medications, non-invasive surgery, and/or…


Clue helps you understand your cycle so you can discover how to live a full and healthy life.

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