Like with everything else, every body is different. This month, once af stopped, my temps stayed b/t 97.0 and 97.3, kind of in the same range yours are in. So I don't think you should worry about them being too low.
Although I didn't think I would be able charting when I started (this is my 3rd cycle) I absolutely love it now
It is so insightful.
When you did chart before, did you chart enough to be able to see the thermal shift and therefore see when you O'd? Are you charting CM as well?
Wishing you lots of luck and baby dust this month...I really hope bbt helps you!