Yes, it is not recommended to do an ultrasound scan in the fifth week of pregnancy because it is possible to see the gestational sac without an embryo. This is because the embryo is still very small and can lead to confusion. On the other hand, the empty gestational sac already makes one suspect that it may be an anembryonic pregnancy, known as a blighted ovum. The woman will have to repeat the ultrasound a few weeks later to check if there is any problem with the pregnancy.
I am 5 weeks pregnant and only the gestational sac can be seen by ultrasound. Is this normal?
By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 09/22/2017
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)