@thirtyandmore right your post explains this chart much more! Temps taken within 2 hours of a regular wake up time will be ok, but 4 hours extra sleep some days than others will be skewing your results. I’m usually asleep by 12, and take my temperature generally between 5-7am. If I slept till 9am I’d discount that day’s temperature because I’ve slept much longer. You need to have been asleep for at least 4 hours as well. You want to be as consistent as possible.
And when we say don’t move before taking it - that really means don’t move! You can’t get out of bed, as soon as you’re standing your heart rate goes up and effects your temperature. Keep the thermometer under your pillow and take it as soon as you realise you’re awake, before moving around too much in bed and definitely before getting out of bed.
If you’ve gone to the toilet and haven’t then slept for 4 hours again afterwards, discount it. You’ve got up and moved around so that’s changing your internal temperature. I often temp at 5-5.30am as I wake up then to go to the loo, then go back to sleep until half 6. If this is a similar pattern to you then temp before you go to the loo rather than when your alarm goes off.
These temps are measuring tiny changes at 2 decimal points, slight changes in sleep length, movement, sickness etc will have big effects.
I use the Natural Cycles app (was contraception but can also be used for TTC) which guides you through all these things and says when to discount a temperature. Might be helpful for you?