A 28-year-old primigravida at 34 weeks of gestation presents to the antenatal clinic with a blood pressure of 158/102 mmHg. She reports headache and right upper quadrant pain for the past 2 days. On examination, she has 3+ proteinuria on dipstick and brisk deep tendon reflexes. Platelet count is 95,000/μL, serum creatinine is 1.4 mg/dL, and AST is 120 IU/L. Fetal heart rate is 140 bpm with normal variability. What is the most appropriate immediate management?