How Basal Body Temperature Works as an Ovulation Tracker
What is Basal Body Temperature?
An increase of 0.5-1ºF indicates the BBT spike, and occurs one-to-two days after ovulation. The purpose of BBT tracking and creating a BBT chart is to find the temperature spike. Traditionally, women take their basal body temperature and manually mark the reading on a printed fertility chart or a note book. Then, they figure out the spike day after consecutive readings. The process to manually pinpoint your spike would take days of works and require a lot efforts.
A coverline is a horizontal line in your chart drawn directly above the last temperature before the spike (see the orange line in the graph above). The purpose of this is to separate preovulatory temperatures from postovulatory temperatures so that the BBT spike can be more evident: you will clearly be able to visualize the difference between the series of lower preovulatory temperatures underneath the coverline, and the series of higher postovulatory temperatures above the coverline.
Thanks to the rapid development of A.I. (Artificial Intelligence), you can sync your temperature readings on the Premom Ovulation Tracker app and find the coverline on your fertility chart.
How Understanding Your Luteal Phase Can Help You Predict Fertile Days
This is because a normal woman’s Luteal Phase (the phase after ovulation day till the next period day) will always be the same number of days, not fluctuating by even one day.
Therefore, if you know both the length of your Luteal Phase – and when you will get your next period, from a proven, accurate menstrual cycle predictor – your next ovulation day can be calculated.
A simple formula is as below:
- Your Next Period Day – Luteal Phase Length = Next Ovulation Day
- Your Current Ovulation day + Luteal Phase Length = Your Next Period Day
Therefore, you can calculate when you will ovulate next if you know the number of days in your Luteal Phase, which is normally 11-17 days long, and if you know your next period day. And you can calculate your next menstrual cycle start date if you know your Luteal Phase length and the ovulation day of your current cycle.
Who should choose BBT tracking as an ovulation calculator method?
The best-suited BBT tracking users are healthy, have a regular life schedule, and have a consistent wake up time. These women could choose a basal body temperature chart as an ovulation calculator.
We highly recommend the BBT tracking method to women who have PCOS, luteinized unruptured follicle (LUF), a short LH surge, or low LH surge levels, because these women can use a basal body temperature chart paired with ovulation tests to confirm that ovulation has occurred.
What Are the Challenges and Solutions of Basal Body Temperature Tracking?
How Does BBT Tracking Work with the Premom App?
The Premom Ovulation Calculator app automatically syncs your basal body temperature after it is paired and connected with the Easy@Home smart basal thermometer.
Premom can calculate ovulation regardless of the huge variety in BBT spike patterns because it has such an advanced algorithm in regards to fertility awareness.
The most challenging part of tracking basal body temperature is reading the chart and figuring out when the BBT spike occurs. However, the Premom app can automatically calculate and draw the coverline in the chart for users to see their own spike.
To obtain a coverline in the Premom app, ideally, certain criteria should be met based on the logged basal body temperature. These criteria are as follows:
- The first six consecutive temperatures should be lower than the next three consecutive temperatures, often referred to as the "6 low, 3 high" pattern.
- The difference between the highest temperature among the previous six temperatures and the lowest temperature among the next three should be equal to or greater than 0.5°F (0.2℃).
To enable Premom to display the BBT spike and draw a coverline, it is suggested that you record at least nine consecutive temperatures in the app. You can either manually enter the basal temperature from any basal thermometer you are using or use the Easy@Home basal thermometer, which automatically syncs with Premom via Bluetooth.
Without using Premom, many women have to take their basal temperature every day throughout their entire cycle, trying to find the spike out of all the temperature readings. After using Premom consistently, the app will understand your pattern better, and you can reduce the temperature-taking to the minimum while still catching your spike.
How to Use a Basal Thermometer
A basal thermometer is a specialized thermometer used for tracking the subtle changes in basal body temperature. It's a simple and affordable tool that can help women track their menstrual cycles and ovulation.
You will want to use a specific thermometer designed for tracking basal temperature as these thermometers are highly sensitive and accurate and can detect even small changes in temperature making it ideal for tracking subtle variations in body temperature.
Some basal thermometers will automatically sync your temperature to an app like the Easy@Home digital smart basal thermometer. This makes tracking your basal temperature as easy as 1, 2, 3!
1. A the same time every morning, upon waking up, turn on the basal thermometer and put it under your tongue. Then relax!
2. When you hear the double beep after less than two minutes, the reading is done. Your temperature will automatically be synced to the Premom app and recored in your BBT chart.
3. Premom will interpret your temperatures and draw your coverline for you so you know exactly when you ovulate every cycle!