Girls, after abortion or miscarriage, they sent me for an ultrasound. The…

Girls, after abortion or miscarriage, they sent me for an ultrasound. The doctor says there are clots of blood in the uterus. And I need to walk more, drink beetroot juice and go to the toilet small. If they don't come out on their own, then the midwife will clean them manually ? Who had this experience? Is this procedure painful? I'm very afraid to get off the chair?