Temp rise question for the BFPers

Hi! Obviously if your temp stays up it's a good sign, but for how long must it continue to rise and how high does it go? I'm 8DPO (9 according to FF) and my temp was quite high this morning. For a good sign, would it have to go higher again in the days ahead or what? Thank you! If you want to post your chart when you BFP that would be great too!