BBT?? Problems! Help! Advise!

Ally • Married 💍 Mother of one.

So I want to start charting my bbt this cycle since we haven’t had any luck with opks strips. (I ordered new OPK, digital ones) I got this easy@home basal body thermometer. Have used it only twice and I feel like it takes a while for it to read..anyone else had problems with there’s? And do you ladies have any recommendations on which one to use.