Hi,
Welcome to ehealthforum,
Most common cause for PCOS (polycystic ovarian syndrome) is insulin resistance, hence treatment with insulin modifiers work in reversing the changes and allowing normal ovulation. Discuss with your treating doctor/gynecologist about getting started on insulin modifiers. Hormonal contraceptive pills are usually prescribed to help with regulating the periods (these do not necessarily change the PCOS changes in ovary). Focus on weight loss and diet changes.
When you are ready for pregnancy, ovulation inducers can be started for you to help with maturation of more than 1 egg in ovary which will increase chances of pregnancy (especially after PCOS changes are under control with treatment with insulin modifiers).
Take care.