Which bbt should I use?

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bbt should I use?" />

I woke up around 5am to use the bathroom i had been sleeping for about 4 hours so I tempted. My bbt was 98.13. I went back to sleep for about another 4 woke up to use the bathroom again, so I tempted again. This time my temp was 97.88. Which temp should I use for my chart?

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