Hey there,
The BBT only means something if you compare it to the other results you had earlier in the month. I used to chart mine and I would be around 36.20 then it would go up and down one or two degrees. It would then drop around ovulation and would shoot up to 36.70, 36.80 and even 36.90. It would then plummet just before the witch arrived. The charting website has other charts to compare with and everyone is totally different so you really need to chart for a couple of months before being able to find a pattern for your body.
Hope this helps!
Lucia xx