Increasingly Longer Cycles (TMI)

For a while now I have had a regular 30 day cycle with a 5 day period. May was a regular 30 days with normal period, June was a 32 day cycle with 3-4 day period, July was a 34 day cycle with brown spotting for a few hours (never happens) before normal flow for two days and that was it. August was a 35 day cycle with brown spotting for a whole day, good flow for a day or so, and then brown spotting for a day. I almost never spot brown and certainly not for that long. Can anyone tell me if I should be concerned? Could this be effecting ovulation?