Whats my blood pressure ?

I can never guess: Most people who check their blood pressure readings don't get the same reading on repeated measurements. Humans are not identical from moment to moment (we're not robots). Our emotions and activities change blood pressures. A person who sees variety in her measurements can just take 2 measurements every time and average them. If aged 50's, hopefully blood pressure is still in the normal range.

Blood pressure is: : "blood pressure is the pressure of the blood w/i the arteries. It is produced primarily by the contraction of the heart muscle. Its measurement is recorded by 2 numbers. The 1st (systolic pressure) is measured after the heart contracts & is highest. The 2nd (diastolic pressure) is measured before the heart contracts & lowest." REF: https://www.medicinenet.com/script/main/art.asp?articlekey=2486