I?m suffering from recurrent miscarriages and we have done all the blood works including karyotyping and genetic carrier testing all are normal and hsg also normal I have pcos and I used metformin and vaginal progesterone also for current pregnancy and my current pregnancy seems abnormal due to large yolk sac and less growth for the fetal pole and less cardiac activity and my question why is happens .why yolk sac seems abnormal this is happen for the second time.