title: Rule out twin pregnancy in first-trimester bleeding.
mesh_terms: D004107:Dilatation and Curettage; D005260:Female; D005313:Fetal Death / Q000175:diagnosis; D005333:Fetus; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000175:diagnosis*; D011261:Pregnancy Trimester, First; D014427:Twins; D014463:Ultrasonography; D014592:Uterine Hemorrhage / Q000175:diagnosis*