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 4 hours. On examination, she is hemodynamically stable with blood pressure 128/82 mmHg and heart rate 92 bpm. Speculum examination shows active bleeding from the cervix. Ultrasound reveals a low-lying placenta with the lower edge 1.5 cm from the internal cervical os. Fetal heart rate is 148 bpm with normal variability. What is the most appropriate immediate management?