A 32-year-old G2P1 at 38 weeks of gestation presents with vaginal bleeding and abdominal pain. On examination, blood pressure is 110/70 mmHg, pulse 98 bpm, and the abdomen is tender with mild rigidity. Speculum examination shows blood in the vagina but no cervical lesions. Ultrasound reveals a placenta covering the internal cervical os with 2 cm of placental tissue overlying the os. Fetal heart rate is 145 bpm. What is the most appropriate management?