trackle sensor system

The difference between our trackleCatch and trackleRegular is that in our trackleCatch has a small hole in the recessed grip to which a return strap can be attached so that the sensor can be easily removed like a tampon. Many new customers therefore choose the trackleCatch.

The trackleRegular does not have this hole and can be gripped and removed using two fingers on the recessed grip. With a little practice this isn't a problem. The trackleCatch can of course also be used without a retrieval strap .

After stopping hormonal contraceptives, your body needs time to “adjust” again and this takes different amounts of time depending on the woman. You can use trackle immediately after discontinuing it. If you have bleeding after stopping (= withdrawal bleeding), you can enter this bleeding as your first menstruation in the trackle app to start your first trackle cycle.

trackle will then assume fertility until ovulation can be detected according to the rules of the symptothermal method (consisting of a high temperature and cervical mucus peak ).

We therefore recommend that you wear your sensor from the 5th day after your period starts and monitor and record your cervical mucus every day.

If you have any questions about stopping the pill or need support, please take a look at our stopping the pill guide .

trackle is reliable from the first cycle because it does not evaluate the cycle based on past data or forecasts, but rather based on your current data, i.e. your core body temperature and your cervical mucus information. These always show whether you have ovulated or not. trackle therefore does not need any time to "settle in".

trackle evaluates your cycle using the symptothermal method. Of course, there must be enough data from the respective cycle for an evaluation. Here you can find out more about how trackle evaluates.

Theoretically, you can wear the sensor during your period, but you don't have to. The first day of your period marks the first day of your cycle.

We recommend using the trackle from the 5th day of your cycle in order to achieve enough measurements for an evaluation - this way you can also comfortably wear a cup or tampon during your period! If you want to wear the trackle during your menstruation, you can only do so in combination with a pad or period underwear.

trackle evaluates using the symptothermal method (STM). Each day is initially viewed as potentially fertile - unless a day can be declared as infertile according to the STM rules.

As you may already know, two of your body signs change reliably and scientifically - namely the cervical mucus and the core body temperature:
The hormone estrogen causes the consistency of your cervical mucus to change visibly as ovulation approaches.

After ovulation, the hormone progesterone is released, which ensures that the body's core temperature rises by at least 0.2 °C. These two independent body signs make it possible to determine when the fertile phase is over - namely when ovulation has occurred. The STM makes use of these scientific findings. Ovulation has occurred when the following two conditions are met:
1. A cervical mucus peak has occurred

2. An increase in temperature has occurred

To evaluate your cycle and release the infertile phase, trackle requires your core body temperature data, which the trackle sensor measures overnight, as well as your cervical mucus information, which you enter in the trackle app. If one of the two pieces of information is missing, trackle cannot (yet) reveal ovulation and therefore no subsequent infertile phase.

If you have any questions about cervical mucus evaluation or need support, please take a look at our cervical mucus course .

You can only get pregnant for up to 7 days in a cycle: These 7 days include both ovulation itself, during which the egg can be fertilized for approx. 12-18 hours, and the days before, because sperm can contain up to Survive in the body for 5 days.

trackle reliably recognizes these days (as well as the infertile days) according to the rules of the symptothermal method and marks them in your app. The STM has been researched in several studies and is very reliable - it has a Pearl Index of 0.4 in method reliability (when used “perfectly”). With the symptothermal method, the core body temperature and cervical mucus are evaluated. This provides “double control” so that fertile and infertile days can be distinguished very precisely.

Please take a look here if you would like to learn more about the rules of the symptothermal method.