Temp question ?

Michelle • 33 year old from Australia , currently pregnant with baby #4 a boy..miss 7 mr 5 miss 1 and prince due 26/01/17
So I'm 7dpo I have been doing my temps this time every morning since ov and it's been 35.6 I had cramping yesterday and temp was 35.2 when I first took it . Now thing is Iv been normally getting out of bed going to kitchen and doing it this morning I did it without getting up . Could this be why is lower ?