A 27-year-old woman, G1P0 at 32 weeks' gestation, presents with new-onset hypertension (152/98 mm Hg) and 1+ protein on urine dipstick. She has no headache, visual change or right upper quadrant pain. Platelets, creatinine and liver enzymes are normal. According to SOGC hypertensive disorders of pregnancy guideline, what is the most appropriate initial management?