If long cycles are your only issue then you are probably fine, esp if you get preg easily. For me, what told me something was wrong is I had cycles that went on for months... sometimes a year or more and I basically ovulated on my own 1-2x a year AT BEST. I also started growing "male pattern" hair growth (hair in the wrong places. Creased skin areas (armpit, groin, etc.) were dark in pigment, noticeably darker. I would shave my pits and they still looked like I hadn't in the mirror. O have lots of skin tags (another wonderful sign). I had acne so bad I looked like a pubescent teenager. Basically, if there is an outwardly visible sign I had it. When I finally got tested my ovaries had cysts galore and my hormones were all over the place.
Chart wise... my chart was a hot mess. After awhile I quit charting after a certain point otherwise FF would not show my chart and just say it was too long to display. I wouldn't O after a certain point anyway, so there was no point in continuing. Here is a prime example. I quit charting after awhile until I could force AF and start a new cycle.
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