Blood pressure borderline high?

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Almost 30 weeks pregnant. I went to the doctor May 5th and my BP was 110/70 , a week later I had my BP checked elsewhere and it was 124/70, today I went to the Dr again for my check up every two weeks and it was 140/80 . I'm now borderline High BP. I actually didn't have ANYTHING to eat before hand bc I had my glucose test today. I wasn't nervous either. My Dr didn't say anything about it being close to high but I started comparing after my appointment and noticed how much it changed. Has anyone else experienced this ?