BBT QUESTION

Diana • Sun, Apr 30

Hi ladies so Here's the problem:

I normally check my bbt around 11, cause that's when I normally wake up... so today I woke up at 7 and checked, but went straight back to sleep but checked again immediately after I woke up at 12 ish ... so the question is which one is the correct one cause the one I took at 12 was way higher than at 7!?