BBT exactly the same 3 days in a row

Is it weird that my bbt has not changed at all in three days? It’s a brand new thermometer, less than a month old. It’s for basal temping, it goes to the hundredth degree. For 11dpo, 12dpo, and today 13dpo, I have taken it at the same time every morning immediately after waking and it’s been a consistent 97.73 every time. Is that normal or good? I took my temp again right now after being awake and moving around a little bit for 15 minutes and it went up to 98.17.

This is my first cycle temping btw.