Stomach flu temp 99.5

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I am 15 weeks I have some sort of stomach flu. I am holding down fluids at this point but my temp has been 99.5 since last night. Should I be taking tylenol. I know a temp of 100.4 is considered a fever but is okay to be 99.5 for this long? I have been checking every hour or so to make sure its not increasing. It was 100 when I woke up but after being out of bed a few minutes it went down.