Nonstress test & BP question

Angel • Lil Sebastian born 9/18/16. I've never been so in love.
Anyone go into an NST and delivered baby the same day due to high blood pressure? How high was it for them to be concerned? Every time I go in they tell me my BP is high but they don't really give much info & they always ask if I've had any coffee??? Sorry this probably sounds stupid I'm just curious.