<s>[INST] Hi I m 26yr old having irregular periods since last 4yrs I m married since last 8yrs and have a 7yrs old boy but badly want to conceive again and want my cycles to b normal cos my periods dont come for months and I have to take duphaston and all my test results come back normal I do not have pcos or thyroids don t know what s wrong?? Pls help and advise Thanks a lot Xy [/INST] Hiplz rule out tuberculosis also. Get a SG done to see if tubes are functioning properly because many a times secondary infertility can be associated with this. Another possible cause of irregular periods -- being overweight, or underweight, can cause a disruption in your menstrual cycles. Both being overweight, and underweight, can also cause an ovulation. Extreme exercise and extreme dieting are more potential causes of irregular cycles. In this case, losing weight may be enough to regulate your cycles again, increasing the chances of getting pregnant naturally. If extreme dieting is the problem, changing your diet to a more balanced plan, and even gaining some weight if you're underweight, can help regulate your cycles. Bbyeee </s>