Hallow Dear, I empathize your feelings due to unsuccessful pregnancy. The description you have given fits into the condition called as Blighted ovum wherein there is gestational sac without embryo in it. Occasionally such cases are noticed. The most likely cause behind this could be low quality of the egg that got fertilized or low quality sperm. This may not repeat again. You are having PCOS and you were given Tab. Benforce-M which is Metformin. PCOS is a three pronged dysfunction. Along with anovulation and delayed irregular menses, it is characterized by high insulin values due to low insulin sensitivity of the tissues and by high androgen hormones. Metformin given to you was with the intension of increasing tissue sensitivity to insulin, thus helping to bring down insulin levels. However, it has been proved now that Metformin has limited role in successful pregnancy; instead Myo inositol gives better results. You may suggest your Gynaecologist about this medicines. It also helps in controlling high androgen levels. Now you are on contraceptive pills to regularise your menses; however, they will prevent your conception. Instead, I would advise you to start on some ovulation induction medicines like Clomiphene citrate or HMG/hCG schedules. These medicines help egg release and hence regularize the menses also. While on the medicines for ovulation induction, ultrasonography ovulation monitoring is always helpful for location the evidence and the day of ovulation. This helps you to plan the sexual relations. I hope you will resolve to such scientific management of PCOS related infertility. This includes bringing down the weight (BMI Since you have conceived once, there are good many chances that you would conceive again. You should not be disheartened by an episode of Blighted ovum once in life. You have chances of normal pregnancy. Hope this helps you. For more guidance and information, you may ask me Direct question. Dr. Nishikant Shrotri