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What is going on with my BBT?

It's all over the place! This is only my 2nd period tracking but last time the cover line was approx 36.4. This time it barely went under and it's zig zagging all over the place. I have PCOS but I don't think that's what's causing this. I don't think I ovulated yet, because I'm tracking cm and cp. And i don't think I'm pregnant.