Hello,
Normal menstrual cycle may vary from 21-35 days and hence your menstrual cycles are absolutely normal.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
i would say 31days same as me i have 31 day cycle