I can understand your concern.
Blood pressure doesn't stay the same thoroughout the day it keeps changing.
The best way to measure Blood Pressure is by using a mercurial blood pressure machine rather than the electronic ones.
There is low accuracy in certain electronic ones and there is a lot of fluctuation also.
Consult a general physician in person for further evaluation and management.
Dr. Anil kumar jain.
BP measurement needs proper cuff application. .proper posture with arm rest and clinician competency.....bp measurement at home by oscillometric method instruments are useful in self monitoring of BP and are useful but again mental and physical stress do have impact on BP reading which might be in your case. .....so ideally we take 3 readings in 3 different opd visit by patient in 1 week before concluding that his bp is raised(ofcourse with no target organ damage)