COULD SOMEBODY PLEASE HELP ME WITH CHARTIN BBT..

Thanks ladies yes I'm aare of some of the possible O signs last month I was doin opks and I got a smiley right at the time where I was experiencing cramping on the left side ovary and I then I had some EWCM although it wasn't alot but it was clear just like egg white and I knew I was close to ovulating but I want to be able to pick up when ovulation has gone which the temp taking picks up.. I've started my CBFM this month too right now I'm on cycle day 6.. Almost approaching 2months since being on the diet