A 28-year-old primigravida at 32 weeks of gestation presents to the emergency department with complaints of vaginal bleeding and lower abdominal pain for the past 6 hours. On examination, she is hemodynamically stable with blood pressure 118/76 mmHg and heart rate 88/min. Abdominal examination reveals mild tenderness over the lower abdomen. Speculum examination shows blood in the vagina but no cervical lesions. Cervical examination reveals cervical dilation of 2 cm with intact membranes. Ultrasound shows a normally located placenta with no evidence of abruption. Fetal heart rate is 145 bpm. She is not in active labor. What is the most appropriate next step in management?