Our expert says:
A blighted ovum is a pregnancy where the fetus has not formed, so there is only placental tissue and a sac. A normal pregnancy between 4-5 weeks may not show the fetus as it is just too early but, without knowing for sure how far pregnant you are, it is difficult to distinguish this from a pregnancy where the fetus has not developed. While this is a worying time for you, the only way to make the diagnosis is to repeat the scan later. In 10 days, a normal fetus would have developed whereas a blighted ovum would still have the same appearance as now.
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