Bbt help please

Dianna

I don't understand BBT but FF is saying i ovulated on cd12 and flo is saying cd14. Previously when test LH its always been cd13-16 for ovulation. I didnt BD until cd13 and i don't know which chart to go by? Usually they match if FF is accurate i am 100% out if flo is right i still have a chance but idk how to read these things. I also still have ewcm. Bbt