BBT Question--timing?

Becca • RN, mama to two daughters, recurrent pregnancy loss survivor, 🌈 baby # 3 on the way
Curious if temping is useful or effective if I leave my thermometer on the bathroom sink and take my AM temp while I pee.... 
​I know it's supposed to be before you get up but I never remember, or if I do it has gone lost from under the pillow... 
​I'm up at around the same time every day even on weekends.
​Any advice? If I can't do it while I'm still in bed should I just not bother?