Starting my basal graph. Success??

So since my cycle is not consistent and never mirrors month to month if I even minstrate at all. I'm going to start using the basal body temperature graph to try and track my ovulation. But check this out I'll need to get a different graph because the one that comes with the thermometer only goes down to 97.8. Iv recorded my temp since Friday. I started minstrating on Thursday. My temp so far has been 97.6-97.7

Here's a picture of the blank chart .

Has anyone had success using this technique?