Bbt chart questions

I had posted this in another group in and didn't get a response hoping this is the right place but anyone else have this happen . Can anyone explain this ? I have been doing research and I know every body is different and how I need to take the test I believe my O was on the 14 if I am reading it correctly but I keep dipping every three days and spiking for three days today my temp was 98.34 what's going on ?