Uff-Da!

Maybe you still aren't over the "white coat" problem in your first reading, regardless of the color of your coat. Some people who tend to have anxiety with BP readings, do take three readings, throw out the first one, and average the others. Now that I've been doing this for years, I only take one reading unless that reading seems "off" from what I'd expected based on my anxiety level at the time and recent readings.

It could just be a difference in technique, too. Were you seated quietly for some time before your first reading? Some suggest five minutes, some ten, some 15. Were your feet flat on the floor? Were you seated in a chair that doesn't put undue pressure on any part of your body? (If taking the reading at my dining room, I have to put something under my feet, to raise them just a bit, as I'm very short-legged.) Was your arm at heart level? (Sitting in the dining room chair with chair turned sideways to the table and my arm resting on the table works best for me. The arm of the chair is too low to be heart level on me.) Did you remain quiet while you were taking your presure? Talking or even what you are thinking can sometimes cause some changes. Or it could be just normal fluctuations from minute to minute. That happens, too, and is nothing to worry about. Your readings over a period of time will sort out the picture.