Lower than normal potassium actually happens more often in pregnant women than should happen according to the books, per my personal experience. You may have one of the renal conditions (silent until now) affecting how successful your kidneys are in reabsorbing potassium into your system; this may worsen in pregnancy but be essentially not problematic at most other times. A rare cause of low potassium and high blood pressure is Conn's syndrome--caused by an abnormality in the adrenal gland. Consultation by your doctor with an endocrinologist/nephrologist can be helpful in determining if there is something significant present and whether or not further evaluation is indicated during pregnancy or postpartum if persistent.
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