BBT rising, what does it mean?

Ann

I should be 6-7dpo and I noticed this morning my BBT is higher compared to what it has been the past couple of mornings. What does it mean once it starts rising?

My bbt the past few days have been:

8/16: 98.04

8/17: 98.01

8/18: 97.66

8/19: 97.11

8/20: 97.06

8/21: 97.32