A 38-year-old patient who is 3 weeks postpartum presents for follow-up and reports frequent headaches and intermittent blurred vision when arising in the morning. Her blood pressure is 128/86 mmHg in the left arm and 122/78 mmHg in the right arm. The next day, the patient returns with worsening headaches and a 2-pound weight gain in 3 days. Her blood pressure is now 156/92 mmHg in the left arm and 148/94 mmHg in the right arm. Which diagnosis is most likely?
A. Pregnancy-induced hypertension
B. Preexisting chronic hypertension
C. Eclampsia
D. Migraine headaches