Concern about pregnancy

Patient: We are a couple of 15 years of marriage with no children. my wife is suffering from hypothyroid since 5 years and diabetes since 5 months. both are in good control with medicaitons. i am suffering from diabetes since 10 years with good control on OHAS. We have had 5 cycles of IUI. Last IUI cycle was on July 18th 2014. This time it was sucessful when my wife tested positive for pregnancy on 11/08/2014. She had ultrasound abdomen on 13/08/2014 which reported as gravid uterus of 5-6 weeks. Second ultrasound on 27/08/2014 showed 1.8 gestational sac, yolk seen, faint fetal pole and no heart beat. Please help us with this situation.