BBT Charting question

So, I just started charting and I'm still trying to get all the information and make sure I'm doing it correctly. The first half of my cycle the temps were below cover line. From ovulation until now the day before AF is due its elevated to the highest it's been. Yesterday97.7 today 98.2. Could they mean something? This is our first month charting and I'm cluless about it all.