Thanks for the query.
Irregularity in menstrual cycles can occur due to many causes.
And poly cystic ovary disease is one of them.
To diagnose that, you consult gynecologist once, get examined and go for ultrasound
Ultrasound can detect the presence of poly cystic ovaries.
Along with that to rule out other factors, with your doctor's advice you can undergo blood tests like hemoglobin
levels and thyroid profile.
With this workup the possible cause for your problem can be identified and treated.
If you are having excessive weight, try to decrease weight.
And try to avoid stress and strain in workplace.
These can help as additive factors in treating the condition.