Last March I was diagnosed with a blighted ovum after 10 weeks pregnant. The whole time I cramped and had brown bleeding and the doctor ordered a sonogram. The sono tech could a see a sac but nothing inside. I had a D and C the next day after the sono. SO for the next 5 months we tried again and in September I was pregnant again. This time at about six weeks we saw the doctor early to check things out. He ordered the sonogram after doing blood levels. My levels were doubling every 48 hours like they should. Then we went to the sono. This time I had had no cranoing and no bleeding so I was excited to see a heartbeat on the sono. To my disappointment again nothing in the sac. I was diagnosed again with a Blighted ovum. My question- Why did I have blighted ovums twice? Is there something my body is missing? What are my chances next time around?