MSFinals-3674

A 32-year-old woman comes in for a routine antenatal check-up at 15 weeks of pregnancy. During the clinic visit, her blood pressure is measured at 154/94 mmHg, which is confirmed by ambulatory blood pressure monitoring. Four weeks prior, her blood pressure was recorded at 146/88 mmHg. A urine dipstick test shows no abnormalities, and there is no significant medical history to report. What is the probable diagnosis?