I'm so sorry to hear about your news. I had this happen to myself several times, and it's heartbreaking. I found out I was preg. With twins. When I had the ultrasound one of the sacs looked fine, but the other was tear drop shapped, and they told me I may lose that one, if not it would have problems. I went back a week later and the tear dropped one was gone, but I never passed it, and the other had no heart beat. I had to have a d&c. Several months later I was preg. Again, I had ultrasounds weekly just to check on the fetus. One day again, no heart beat, I had to have another d&c. The doctor did test on me to see if there was a reason I was having miscarriages, but all the test come out neg. Years later I had to have a hysterectomy due to endometriosis, and they Dr. Said that was probably the cause of it. I know it is hard, but remember god lets everything happen for a reason, even if we don't understand why.... Good luck and my prayers are with you. Let us know how you are