Temping changes

So I took my temp at the same time as I do every morning. No movement, other then reaching for my thermometer and shutting off my alarm, I took my first temperature and it was 97.90. I immediately took it again within a second without moving or anything and then next went to 98.04, which matches what my temp was yesterday which one would you go with? Why within a second and no change in positive would they be different? 98.04 is where I was yesterday and the other temp would be a dip? I also noticed when I woke up my heavy blanket I usually sleep with was not on me.

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