Hello Thanks for writing to us with your health concern. See, there are certain indications for bariatric surgery. If your BMI is more than 40, then bariatric surgery is indicated, unless there are co morbid conditions affecting your health. Any kind of special diet is contraindicated , as you might run the risk of developing nutritional deficiencies, which is best avoided while planning pregnancy. Why dont you try sincere exercise and diet for 6 months , before going on to something else ? please post your BMI and health status so that I can opine better. It is best to lose weight before planning a pregnancy, if you are obese, so that , there are no further complications during pregnancy. Metformin will aid in weight loss and symptomatic control of PCOS. All the best. Take care.