A 30-year-old G1P0 at 34 weeks' gestation presents with new-onset blood pressure 155/100 mmHg on two readings 4 hours apart and 2+ protein on dipstick; platelets are 220 ×10⁹/L and creatinine 70 µmol/L. She has no headache or visual symptoms and normal liver enzymes. According to SOGC Guideline No. 426, what is the MOST likely diagnosis?