BBT advice please.

Was using a non ovulation thermometer previously but was not accurate. I'm using an ovulation one now. During af (5 days) temp was 36.32 (Celsius) and after seem to stay around 35.35 for the past week. Its gone from 35.35(thursday) to 35.45(friday) to 36.02(yesterday) to 36.05 (today). Does this mean I should start using ovulation tests now? Not 100% sure how bbt works. My gp told me to start testing when my temp rises after af has been and gone though. Any advice appreciated