I have a BBT thermometer (duh

) and it measures to the 1/100th (I think. I am having serious brain issues this morning.) For instance, my temp this morning was 97.24 - but on my chart, I can only enter in to the 1/10ths. (97.2 for example.)
If my temp ever hits 97.25 (for example), do I just round up to 97.3, or leave it at 97.2?
(I so hope I didn't confuse you!!

)
**ETA** and I just thought of another question. How big of a difference does it make in time when taking temps? I temped yesterday at 7:30 a.m., and this morning at 6:30 a.m. I have a 1 year old, and he gets up usually at either one of those times.