I have been taking my temp at work (doctors office, ear thermometer, and yesterday was 99.0, today…

I have been taking my temp at work (doctors office, ear thermometer, and yesterday was 99.0, today it's 99.6. I feel fine, no symptoms of a cold or illness. I am 5 dpo. Thoughts? I also had a metal taste in my mouth when I drank a coke🤔 hehe, very odd!