6dpo and temp is 99.35

I'm 6dpo today, I just took my temperature this evening and it is 99.35! This is the highest I have ever seen my temperature! I don't feel poorly, just very dizzy and having a hot flush .. What could this mean? I haven't recorded it on my bbt chart as I use that for my morning temps but I took my temp out of curiosity this evening and it's very high.. Should I be worried? Is this a good sign? Is it too high?