to early to use BBT?

Kershal • MC 9th oct 2014, BFP 10th Oct 2015
i know yiu cant tell properly till about 3ish months of charting, but my bbt has been higher then usually is last few days its usually 35-36is but its been 37 is that too high of a jump or? only 9DPO so yes its still early , but what else could it mean why its that much higher?