1. What happens if the embryo is not seen during 60 days of pregnancy? Under normal circumstances, around 60 days into pregnancy, the embryo should have developed to the embryonic stage. If a B-ultrasound examination is performed at this time and the embryo cannot be seen, it means there may be a problem. This condition is called an \”empty cyst,\” meaning there is a cyst without a fetus inside. 2. What are the symptoms and dangers of empty cysts? 1. Symptoms: Empty cysts usually do not