A 32-year-old G2P1 woman at 34 weeks gestation presents with new onset headache and visual blurring. Blood pressure is 162/104 mm Hg on two readings 15 minutes apart. Urinalysis shows 3 plus protein. Reflexes are brisk with no clonus. Platelets are 110 x 10^9 per litre, creatinine 110 µmol per litre, and ALT mildly elevated. According to SOGC guidelines, what is the most appropriate immediate management?