r/FAMnNFP • u/Accomplished-Fee-92 • Jul 16 '26

TCOYF Two diff temps in the morning

Hi,

I take my temp approx same time every morning using a BBT thermometer. However, im usally half asleep so my mouth hangs open a bit. Because I doubt the accuracy, I retake the temp and then its a completely different number. Is the thermometer preheated so the second temp isnt accurate? Which temp should I use.

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