thanks for the query,
On TVS heart beat is seen at 5 weeks.
A "blighted ovum" is a condition where conception occurred and the fertilized egg implanted in your womb but the baby did not develop. It is a large empty sac with no developing baby inside. A blighted ovum can happen to anyone. It usually happens accidentally, and most women go on to have a successful pregnancy
If the pregnancy sac measures more than 20mm, with no evidence of a yolk sac
or embryo, then a diagnosis of blighted ovum will be made
If the diameter of the pregnancy sac is less than 20mm, your pregnancy may just be less advanced than you thought, and you will be offered another scan after 7-14 days. If there is still no sign of a yolk sac or embryo after this time, the diagnosis will be confirmed.
Continue taking folic acid
and be positive.