Varying Cycle Length

Anyone have experience with varying cycle lengths....I mean VARYING! ? back story on mine: May 11, 2014 I stopped BCP. Break through bleeding May 15-21st. 1st cycle was 31 days, 2nd was 27, 3rd was 31, 4th was 42, 5th (current cycle) I'm on CD 24. No clue when I O'd this month so no clue when AF might show. My biggest question is if anyone else has experience like this and if you had to get doc/meds to regulate??