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12/01/2025 1:34 p.m.

Getting Started with Lady-Comp

Hi! Welcome to the Lady-Comp family! Your start into a world full of cycle knowledge

We’re glad you’re here. Tracking your fertility with Lady-Comp is going to be easy, but like with every new beginning, there’s a few things to know before you get started. Please remember it’s natural to feel a little unsure of things at first, but soon you and Lady-Comp will come to know each other closely, and you’ll love the newfound knowledge of your cycle and fertility!

Before you begin:

Before you start using Lady-Comp, there are a few important tips to ensure your measurements are accurate and reliable from the very beginning. Whether it’s about stopping hormonal contraception, finding the best time for your first measurement, or tracking your period, these guidelines will help Lady-Comp evaluate your cycle as effectively as possible. Take a moment to read through the following advice, and start your Lady-Comp routine feeling calm, confident, and well prepared.

The first steps with Lady-Comp

  • If you’re on hormonal birth control, you must stop before using Lady-Comp. You can start temping the day after you’ve quit. Remember – the first bleeding after stopping HBC is a hormonal withdrawal bleeding, not a true period, so please do not enter it into your Lady-Comp as a menstruation.

  • If you’re taking hormonal supplements, please consult with your doctor or our support team before beginning with Lady-Comp.

  • If you’re currently menstruating, and it’s not the first day of your period, please do not enter menstruation for this cycle. Menstruation always needs to be entered starting on the first day of active bleeding and flow. You don’t want Lady-Comp thinking the third or fourth day of your period is actually the first.

  • If you’re sick with a fever, hungover, or didn’t sleep well last night, please do not temp, and take good care of yourself! You can temp again when these issues have passed.

  • It’s exciting to get Lady-Comp and you want to start now, but first sleep - however, it is important to set the alarm before the very first measurement. Be sure to use Lady-Comp daily right after you wake up, before you get up and get active. For optimal use of Lady-Comp, we recommend that you have at least 1 hour of continuous sleep before measurement.

  • There are a range of different factors that can influence your cycle, find out more about them here:

Influencing factors

This is how you measure correctly with Lady-Comp

For reliable results it is important that you measure your basal body temperature the same way each morning.

The button functions

Step 1 - Activate your Lady-Comp

  • Remove the strap marked from the device.

  • Set the wake-up time (once) for the next morning.

  • Navigate to the alarm, open the input window by pressing the circle button and set the alarm time using the plus and minus button. Confirm the entry for each field by pressing the circle button. The alarm is activated when you have set a check mark in the last field and confirmed it with the circle button.

  • You can now use Lady-Comp – but a measurement is only possible on the following day. After the first successful measurement, you can also measure without the alarm.

Step 2 - Measuring your temperature

Lady-Comp needs to learn your cycle. Take your basal body temperature every morning after waking up and before you get out of bed. For optimal use of Lady-Comp, we recommend that you have at least 1 hour of continuous sleep before measurement.

  • Place the measuring sensor as far back as comfortable to the left or right under your tongue and close your mouth.

  • Press the circle button to activate the device. Then, start the measurement by pressing one of the 3 buttons.

  • You will hear a beep at the end of the successful measurement, and the measured temperature as well as the fertility status, which is is valid until midnight, are displayed.

Schritt 3 - Entering your menstruation

In addition to your temperature data, Lady-Comp needs your menstruation data in order to calculate your cycle. If you see a question mark in the input field for menstruation after measuring, it means that Lady-Comp is asking you for your menstruation input.

  • If you are menstruating: Press and hold the circle button for 3 seconds to open the input field and enter your menstruation by pressing the plus button. Confirm the entry by pressing the circle button. Enter your menstruation for each day of active bleeding and flow for a minimum of 3 consecutive days.

  • If you are not menstruating: You do not have to do anything.

  • If you are menstruating, but you do not see a question mark: Press and hold the circle button for 3 seconds. Enter your menstruation with the plus button and confirm the entry by pressing the circle button twice.

Step 4 - The fertility window

After entering the first menstruation, Lady-Comp shows you the fertility status for the current day with the color of the home screen. In the fertility window you can see the details of the last measurement.

By looking at the display color, you can immediately see whether you are currently fertile or not.

Here can find our most frequently asked questions (FAQs):

Do I have to measure at the same time every day?

No. But be sure to use Lady-Comp daily right after you wake up, before you get up and get active. For optimal use of Lady-Comp, we recommend that you have at least 1 hour of continuous sleep before measurement.
How long does it take to measure?

It will take approximately 60 seconds to measure.
I have to get up frequently during the night because I have a baby. Can I use Lady-Comp even with little sleep?

Yes, but be sure to use Lady-Comp (or Pearly) daily right after you wake up, before you get up and get active. For optimal use of Lady-Comp, we recommend that you have at least 1 hour of continuous sleep before measurement. If you don't get that during certain nights, there is no reason for concern. Lady-Comp (or Pearly) can handle skipped measurements from time to time.
When can I start using Lady-Comp?

You can immediately start with the measurements. If you were using hormonal birth control before, stop using it before you begin measuring. The first bleeding after coming off hormonal birth control is a withdrawal bleeding and must not be entered as your period. If you are menstruating when starting with Lady-Comp and you cannot enter all days, do not enter the current menstruation, but the next one. The first day of menstruation is important because it marks the beginning of your cycle.
When can I start to rely on Lady-Comp's results?

You can rely on Lady-Comp's results starting the very first day of use. In the beginning, you will see more yellow and red days because they Lady-Comp is still learning your unique cycle rhythms. You will see more green days as the device comes to understand your cycle and can narrow down your fertile window. The more regularly you measure, the better.
How accurate is Lady-Comp?

Lady-Comp determines your non-fertile (green) days with a scientifically confirmed accuracy of 99.4%. This was verified in a published study of 5,328 women and over 107,000 cycles from Germany and Switzerland. The algorithm behind it has been developed since 1986 and draws on over 10 million analyzed cycles. When there isn't enough data, Lady-Comp shows a yellow light instead of guessing.

Sources: Dessole, S., Fadda, M. C., Rosas, N., Scapinelli, A., Inaudi, P. & Ambrosini, A. (1997). Monitoring of ovulation by sophisticated digital electronic BBT recording "Baby-Comp" in patients with unexplained infertility. International Meeting on Infertility and Assisted Reproductive Technology, Porto Cervo, Sardinia, June 11–14, 1997, Program and Abstracts Book, p. 253. (Conference abstract) Freundl, G., Frank-Herrmann, P., Godehardt, E., Klemm, R. & Bachhofer, M. (1998). Retrospective Clinical Trial of Contraceptive Effectiveness of the Electronic Fertility Indicator Ladycomp/Babycomp. Advances in Contraception, 14(2), 97–108. DOI: 10.1023/A:1006534632583.

Binkiewicz, P., Michaluk, K. & Demiańczyk, A. (2010). Calculation of the Pearl Index of Lady-Comp, Baby-Comp and Pearly cycle computers used as a contraceptive method. Ginekologia Polska, 81(11).

Demiańczyk, A. & Michaluk, K. (2016). Evaluation of the effectiveness of selected natural fertility symptoms used for contraception: estimation of the Pearl index of Lady-Comp, Pearly and Daysy cycle computers based on 10 years of observation in the Polish market. Ginekologia Polska, 87(12), 793–797. DOI: 10.5603/GP.2016.0090.

van de Roemer, N., Haile, L. & Koch, M. C. (2021). The performance of a fertility tracking device. The European Journal of Contraception & Reproductive Health Care, 26(2), 111–118. DOI: 10.1080/13625187.2021.1871599.
All questions about Lady-Comp at a glance
Instructions for Use of Lady-Comp

Get more information in our blog

Your Guide to Reading Basal Temperature Charts. Learn how to recognize typical temperature patterns and interpret signs of potential health changes.

Understanding BBT

By understanding your cycle, you can adjust nutrition, mood management, and exercise to align with hormonal changes, using your cycle consciously to your advantage.

Hormones & Their Influence

Learn when cycle irregularities are harmless and when it’s wise to see a doctor. Discover important warning signs, like missed periods or very heavy bleeding.

Recognizing Cycle Irregularities
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