Yeah I have recently played the "Body Temperature Game" (as I like to call it) with myself. I had a 4 or 5 day run of 99.4 every evening, so, of course, I assumed it MUST be cancer.
After a few days it went back to a more normal 98.6. For a while I was running at 97.7 all the time, so I guess it fluctuates a lot normally.
I have been forcing myself to do two things. 1. NOT taking my temperature every freaking day. 2. Not looking up my symptoms on "Google" under ANY circumstance.
Doing these 2 things helps. I think you'll be ok if you try doing the same as well.