Basal temp before period...

Claire
Hey ladies just curious.
I'm due Monday 'boo' and sadly expect to come on... But the last 2 days I just thought to check my basal temp as soon as I wake up.. 
Well today is was 36.86 and yesterday it was 36.40
It's probably a fluke and just my off body...as for the last couple of months I've not been ovulating. 
Anyone else had this? Cx