Girls, hello ? 36 weeks of pregnancy blood test is negative 2, sent fo…

Girls, hello ? 36 weeks of pregnancy blood test is negative 2, sent for an ultrasound of the fetus showed abnormalities in the vessel on the right side, how do I understand it? Is it dangerous? My doctor says it's normal, only every two weeks you need to undergo ultrasound, please tell me is it dangerous? Calm me down, little one.