Hiya. This morning when I temp at 7.30am I got 98.2 and I temp again at 8.30am I got 98.4. But it has also happened the other way round, when I temp earlier I got a higher temperature (I think it was nearing AF time and progesteron level was dropping, I'm guessing).
Not too sure about the 20 sec and 45 sec temp though. What does it say on your thermos manual, do you have to wait till 45 secs to get an accurate temp? If it says so in the manual, then I would think the 20 sec temp is inaccurate but I could be wrong. If the manual say anytime between 20-45 secs then I would think the 20 sec temp is still correct. I think the reason it beeps early is because your body temp was more consistent that day, so it gives the reading in a shorter time. (makes sense?) heheh.