For the trackle evaluation, the warm-up phase – the time when you first insert the trackle – and the cool-down phase – the time when you take out the trackle for cleaning and synchronising – are cut off and not included in the calculation of the basal body temperature value.
These warm-up and cool-down phases are also cut off every time you remove the trackle during the night, to use the toilet, for instance. So you don’t need to worry!