A 28-year-old multigravida (G3P2) at 34 weeks of gestation is admitted with painless vaginal bleeding (approximately 300 mL). Ultrasound confirms placenta previa (partial type, partially covering the internal os). The patient is hemodynamically stable, and fetal heart rate is reassuring. She has had two prior episodes of bleeding in the past 3 weeks. What is the most appropriate next step in management?