Had tvs earlier due to 8 days bleeding and saw empty gestational sac. im 7w6d but gs age is only 6w5d. sonographer said to repeat tvs after 1 week to rule in or out blighted ovum. what does that mean?

What will be will be: Let nature do what it does, and not worry until after next week's scan. That is because only a portion of conceptions become successful pregnancies. Nature weeds out genetic mutations and other abnormal embryos, in trying to preserve the human species. It has worked fairly well thus far, bringing us here from even before our caveman days. Be hopeful, but don't worry. Blighted is failed conception.