BBT Questions

Anna • 27 💁🏻 Married 5/23/15 👫💍 One baby girl born May 2018. 👧🏻

Okay, I have yet to try temping and thought I would start this cycle since I haven't been able to get pregnant for the past 5...😕 I'm curious as to how charting works and also, where can I find the best thermometer as far as accuracy? TIA!