Temperature and My Thyroid

So my temperature this morning was up to 97.7 so they are coming up.  Last night I took my temperature on a whim (the doctor didn't ask for night-time readings, I just wanted to see) and it was at 97 at 9:30 p.m.  I really need to learn more about what the temperatures mean in terms of my thyroid. The doctor's receptionist said I was taking them for my thyroid (but she couldn't explain why, she said the doctor knew why) but would it have anything to do with my adrenals as well or cortisol? I have no clue!

This is an area of my thyroid care I haven't delved into deeply yet.  It is one I am going to have to put on my "to do" list this week.  I should have five days' worth of temperatures in two days to call my doctor back with them.  I need to have a general understanding before then.