Either way, none of these are considered high. 120/80 is considered normal so I think if you normally have low BP you have further to go before it's a problem. If your doctor is concerned, they'll probably do a 24 hour urine
I had low BP before my pregnancy, my BP was normally around 108/70 , @ 37 weeks it was 124/80, 2 days later it was 198/130. My dr knew 124/80 was high for me so she ordered urine test. That test showed preeclampsia protein levels. Call your dr & see if you can get a BP check & urine test. 🫶🏽
I’m not a doctor but I had preeclampsia and was told: When taking a blood pressure reading, "three readings" refers to taking three separate measurements in a row, usually waiting a minute between each one, and then averaging the second and third readings to get a more accurate picture of your blood pressure, as the first reading can often be higher due to stress or anxiety ("white coat syndrome") ; this practice is recommended by many healthcare professionals to get a more reliable result.