A 32-year-old multiparous woman at 28 weeks gestation with chronic hypertension presents with mild vaginal bleeding and mild abdominal pain. Vital signs are stable (BP 145/92 mmHg, HR 82 bpm). Fetal heart rate is 140 bpm with reactive NST. Ultrasound shows a small retroplacental clot (2 cm) with 60% placental abruption. Hemoglobin 10.8 g/dL, platelets 180,000/μL, fibrinogen 320 mg/dL. What is the most appropriate management?