How does BBT work?? Anyone able to help me out with the whole BBT??

Brandi • I am 37 yo w/ a 8 year old son. Me and my SO have been together for 15 years. We have our son together and four fur babies😻. TTC #2.

Hi! I’m 37 y/o and TTC #2 after almost 8 years with a Mirena IUD. I’ve been trying to track my bbt but I truly do not understand how it affects getting pregnant. I do it the same time every morning before I do anything. My numbers are all over the place. It’s very confusing! Any help or advice would be greatly appreciated.