September, 6 october 16 november 28 january 2 is that irregular period?

Irregular Cycles. You have irregular cycles with the history of 40, 43, and 35 day cycles. Normal cycles occur about every 28-35 days. The question is what the problem? If the cycles are irregular and you do not ovulate or the unpredictable bleeding interferes with your life then you need treatment. We have medications. If you ovulate and are otherwise ok then you may not need treatment. Check with your doctor.