Today I had an ultrasound, they found hypertonus of the uterine body o…

Today I had an ultrasound, they found hypertonus of the uterine body on the posterior wall (retroplacental), said there is a threat, need to go to the doctor. Now I'm very worried. Tomorrow I will go to the doctor. But maybe someone has had this. How serious is it? Can they put me in the hospital or treat me medicinally?