induction due to blood pressure..question

My BP has been elevated since the second trimester. The plan was to monitor it and add meds if absolutely necessary. My blood pressure will range anywhere from 135/85-150/100. Today I just took it and it was 152/90. My OB's plan was to induce me if it got too high but when I asked for a specific number she said anything above 140/90 consistently. At my 39 week appointment yesterday it was 145/90. 3 weeks ago they set me up for an induction when I'll be 40 weeks exactly this Monday. What I want to know is, should I go in before that if my BP is hanging around 140/90? I see so many people getting induced at 37-38 weeks for high BP. I guess mine isn't high enough? How high was your blood pressure if you got induce due to that reason?