Need Help?

Relax. You're in the right place.

Questions About Glow

How do I delete my account?

To delete your account head to your Me page (iOS) or More page (Android) > Account Settings. Scroll to the bottom of the page to find the "Delete Account" option. In iOS, the Delete Account button is found beneath the Log Out button.

Deleting your account will wipe your account data from our systems. Your information cannot be restored or recovered. Please consider this before you delete your account.

Glow Article


Why was I billed $48 for Glow!?

Glow users are entitled to try Glow premium for free for 14 days**! If you forget to cancel your trial before the end of your trial period, your account becomes automatically subscribed to our yearly subscription model. Your account will be charged once a year for $48 dollars (~$3.99/month *12 months).. 

If you attempt to enroll in a second premium trial (each Glow user is only entitled to one free trial), your account will automatically enroll you in the annual premium subscription and charge your account. 

**Note the Google Play Store/iTunes Store will bill you for the subscription cost up to 24 hours before the end of your 14 day trial. 

I inputted my initial cycle length as 28 days. Why are my predictions not reflecting this?

The initial cycle length input is there so that Glow’s algorithm can learn your baseline. However, this information is only used initially, and once you start to input actual cycle dates, Glow will use that data to predict your future periods.

If you’re wondering how your initial cycle length stacks up with your averages in Glow, go to Home > Period/Edit Period and look at the ‘List’ view on your calendar. There, you’ll see the cycle lengths that you’ve previously reflected in your start and end date inputs. If these look incorrect, reach out to us at and we can help you get this figured out! If they’re spot on and matching with your calendar dates and your memory, you may just have a different cycle length than you thought :)

Where is the miscarriage status in Glow?

At the moment, there isn't a way to log a miscarriage in Glow, although this is something we’re working to improve. The app will “read” the gap in period data as a long cycle, which may skew your cycle averages in the Genius section. However, this long cycle does not impact your cycle predictions, because the app excludes any such outliers from its predictions. If your predicted cycle length is not what you’re expecting now, reach out to our Customer Support Team at and they can get your predictions back on track! If the predictions seem spot on, we would suggest not changing the data.

If you’re looking for a Community in which to learn about others’ experiences with miscarriage and meet other women, you can download Nurture, our pregnancy tracker app, and choose the Healing from loss status. That will provide you with a unique Nurture experience designed to ease you through this difficult time.

Why is my fertile window right after my period?

Are your cycles shorter than 27 days? If so, it’s not a glitch that your fertile window starts almost as soon as your period ends!

Most women have very defined Luteal Phases - that is the amount of time that lapses between your ovulation and your next period. Usually, it lasts 14 days +/- a day or two.

For example, if your period lasts 6 days and you have a 26 day cycle. Then you will most likely ovulate around CD12. Since your fertile window itself is 6 days - that will mean that your fertile window will start as soon as your period ends (sometimes earlier - that is how women get pregnant while they have their periods).

For example:

CD1 - CD 6: Period

CD7 - CD13: Fertile window + Ovulation

CD14 - CD26: Luteal Phase

If you have a short cycle and are TTC, it is all the more important to start tracking your basal body temperature (BBT), cervical mucus (CM), and/or take ovulation tests. Some women have shorter than average luteal phases - and the only way to know for sure is to track your cycles more closely.

Why does my fertile window move suddenly throughout the month?

In Glow, your fertile window adjusts retroactively in response to your BBT logs. These types of tracking are by nature "retroactive" in the sense that the temperature spike or the peak OPK result shows that you have ovulated the day before.

We completely understand how confusing this can be, however the app itself is working properly to incorporate your log information into its predictions. Glow needs to take your previous data into account to refine and improve your future predictions, so when these changes occur, you can think of it as Glow getting more and more well- informed about your unique cycle patterns!

I don’t get periods every month, and my cycles are usually around 60-90 days long. How do I stop Glow from predicting monthly periods?

This is a great question! Currently, Glow’s period prediction algorithm assumes a period every month, but we are looking to make future improvements to this. If you do not have monthly periods, make sure that you set your initial cycle length to somewhere between 60-90 days, so that Glow understands your baseline. You can do this by going to Me > My health profile > Initial cycle length. If you’d rather not see Glow’s period predictions and want to add your periods yourself as they come, you can go to Me > Account Settings > Period prediction and toggle off. That way, you can turn predictions on and off when you want and add your periods as you please!

What is Glow?

Glow is the world’s best ovulation calculator, period and fertility tracker. Glow helps women learn about their fertility, whether they're avoiding or attempting pregnancy. Learn more about it here!

How do I log data in Glow?

You may log data by clicking 'Complete Log' in main screen. Simply tap on the ✔ or the ✘ on the data entry form to enter and fill out any additional data from the drop-down menu. 

If you did not feel any symptoms then you may click the ✘ to indicate as such. 

Some items such as ovulation tests and pregnancy tests, you can first choose the brand of ovulation test. And then simply click the image that best fits what you see on your actual physical test. For example, if you see a smiley face, click a smiley face. 

Other items such as weight and temperature require data entry of numerical amounts. For these items, the app will automatically show the last data entered. You may click on the number to indicate that the number has remained the same for today. 

How do I edit my period in Glow?

In the iOS app, you can edit your period by clicking the Period button on the top right corner of the Home page. 

In the Android app, click the “Edit Period” button on the center right of the Home page. 

Both of these steps will take you to the Period Log, where you can:
  • Edit a cycle by tapping on a pink period. Simply drag and drop the little blue circles until your information is correct.
  • Add a cycle by tapping on the date the cycle began.
  • Click the “My period is late” button at the bottom of the screen, if your period is late.
  • Click the "My period started today" button at the bottom of the screen, if your period came early.

What do the different colors in the Glow calendar mean?

Colors in the calendar indicate that a certain day is a fertile day, a period day, or neither. 

A day colored pink is an expected period day and a day colored green is an expected fertile window day. All other days are colored blue or not colored depending on your calendar view. Future days will be colored with our best guess based on the information you’ve provided and our algorithms.

Additionally, symbols on each day will remind you if you took your medication, filled out or daily log, or had sex. 

How do I change the data I entered when I signed up for Glow (such as average cycle length)?

You can change your initial data by heading to your Me page > Health profile. That said, over time Glow will learn from the information you share and update your average period days and cycle length to best represent your actual cycle. For this reason, you should not have to tinker too much with the initial information.

Can I import my data from other apps to Glow?

Yes, you can! Glow is connected with five of the world’s top health apps, including:

  • MyFitnessPal (on Glow and Nurture Android and iOS)
  • Jawbone UP (on Glow and Nurture iOS only)
  • Apple’s iOS Health app (on all iOS apps)
  • Google Fit (on all Android apps)

Why are some of my previous periods shaded in my period calendar?

Those shaded periods are unconfirmed period predictions: they're predictions that Glow made for you that you didn't alter. To confirm them, click on them and click "Save". 

How can I connect Glow to Apple HealthKit?

First off, go to your Me page within Glow and click "Connect with health apps." Then turn on Health app, click the red "All Categories on" link and click the "Allow" button on the upper left. You should be able to see a plethora of Reproductive Health options as well as Sleep, Weight and Exercise.

Can I use the metric system with Glow?

Yes. You can select your unit preferences for height, weight and BBT in your Me page > Settings > Preferences. 

What is Glow Genius and where can I find it?

Glow Genius is the command center of Glow and is the center icon at the bottom of the app. Within Glow Genius you will be able to access your charts, including your weight, calorie, nutrition and cycle charts. You will also be able to see a summary of your past cycles and get daily insights into your health.

What do all the acronyms mean? TTC, BBT, CM?

The fertility community very much has its own lingo. We have used several of these acronyms in Glow. Here they are in no specific order: 

TTC - Trying to Conceive 

DPO - Days Past Ovulation - used to keep track of the days of the luteal phase. 

BBT - Basal Body Temperature - Your basal body temperature (BBT) is your lowest body temperature in a 24-hour period. 

OPK - Ovulation Predictor Kits - These are test strips you can buy at a pharmacy that you use to determine when you are about to ovulate. Recently there are more advanced digital versions. 

HPT - Home Pregnancy Test – These are hormone tests that you can take at home to determine if you are pregnant. 

CD - Cycle Day - indicates what cycle day you are currently on. CD 1 is the first day of your period. 

CM - Cervical Mucus - Every woman produces cervical mucus. It is a discharge that can vary throughout the cycle. It can be tacky, sticky, egg white, and lotion like. It can be clear, white, and sometimes yellow tinged. Many women find the cervical mucus check to be the best way to predict ovulation. 

EWCM - Egg White Cervical Mucus - The increase in estrogen around ovulation causes a female's body to produce an abundant amount of cervical mucus. This creates a sperm friendly environment that is ideal for conception. 

LH - Luteinizing Hormone - This is the hormone that surges causing ovulation. It is what OPKs check for. 

hCG - Human Chorionic Gonadotropin - This hormone is what a HPT tests for. It is the pregnancy hormone. 

Luteal Phase – Most women have a consistent period of time between ovulation and their period. This is identified as your luteal phase.


There are other acronyms you may see in the Community. 

2WW: Two week wait (before testing, not always 2 weeks)

AF: Aunt Flo, your period.

BD: Baby Dance. Have intercourse for conception purposes or by extension any form of insemination.

BFN: Big Fat Negative (pregnancy test)

BFP: Big Fat Positive (pregnancy test)

CD: Cycle Day

CH: Crosshairs- the lines drawn on the chart to indicate ovulation

CL: Coverline

CP: Cervical Position

DH, DD, DS: Dear Husband, Dear Daughter, Dear Son

EDD: Estimated Due Date

FSH: Follicle Stimulating Hormone

GnRH: Gonadotropin-releasing hormone

IUI: Intra-uterine insemination

IVF: In-vitro fertilization

LMP: Last menstrual period. The first day of your last period.

LOL: Laughing out loud

LPD: Luteal Phase Defect

M/C: Miscarriage

O: Ovulation

POAS: Pee on a stick

RE: Reproductive Endocrinologist- Fertility Specialist

TTC: Trying to conceive

How do I know when my next fertile window will be?

Your next fertile window is indicated by the calendar. You can flip through to future days or see you monthly view by pull down the calendar (iOS) or tapping 'Monthly View' in the upper right corner (Android).

The next “green” colored day will indicate your fertile window and should contain an estimate of your chance of conception for that day.

Why can't I see my "green" fertile window on Glow?

Whether or not you see your fertile window is dependent on whether or not your status is "Trying to Conceive" or TTC. If you are actively using certain birth control methods, the app will also not show a fertile window. For example, if you're on the pill, Glow would not display your fertile window because the hormones in the pill are preventing you from ovulating and having a fertile window. If you don't have to worry about it, we won't show it to you!

I'm not currently getting my period. Can I turn off my predictions?

Yes! You can turn off your predictions within your Me page > Settings. Note that this will also turn off your fertile window predictions.

I had a miscarriage. How do I start using Glow again?

We’re so sorry to hear about your miscarriage. If you have been using Glow Nurture, you can change your status to "Healing from loss" by navigating to the Me page and clicking "See all statuses." This new setting will provide you with a new Nurture experience designed to help ease you through this difficult time. 

When you’re ready to return to Glow, head to the Me page and change your status to “Trying to conceive.” You may want to also turn off your period predictions (Me page > Settings) until your period restarts. 

Can I track my medications/supplements in Glow?

Yes, you can! Open up your Daily Health Log, scroll to the bottom and click the “Medication List” button. From there you can add a new medication or supplement and even set yourself a reminder so you remember to take it!

I’m pregnant. Is there anything I should do with the app?

Congratulations!!! We wish you a healthy and happy pregnancy! 

And yes, please do tell us about your pregnancy. You can do so in the ‘Me’ page. Click the ‘I’m pregnant’ link. When you do so, you will be given an opportunity to share your story. We love hearing about the joy of our users. You will also be able to update the settings of your app such that you no longer receive any fertility related notifications.

I can't remember my passcode and now I'm locked out of the app, what should I do?

Your passcode is automatically reset when you delete and reinstall the app. After you reinstall, sign in with your email and password. Then, you can set a new passcode by heading to you Me page > Settings. 

How do I use Google Voice Control on Glow Android?

First, activate voice control by saying "Okay Google!"

Then, you can log your BBT or the start of your period by saying "Log 'My BBT is 98.2' on Glow" or "Log 'My period started' on Glow".

Glow will then either input your BBT into today's daily log or pull up your period calendar so you can update your period start date. Welcome to the future :)

Please note that Google Voice Control will only work for you if you've received the latest update from Google. Also, know that a poor network connection can disrupt Google Voice Control. Make sure you're connected to a strong data or WiFi connection when you use it!

Still can't find your question above?

Don't worry, you can contact us for more information.

Email Us