Charting with 4 Periods a Year?

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I'm on birth control pills that only give me a period four times a year (off-brand Seasonique). I've been recording my BBT, weight, CM, etc but I'm wondering if the effectiveness is put off at all by the kind of pill I take. My BBT is all over the place. My CM seems random too. 
Does anyone else take this kind of pill? How does the charting and tracking work for you?