Is it possible for my blood pressure to be the exact same 3 days in a row? even if has been taken at different times? 115/77!

If your lucky week: If it's your lucky week, you can randomly get the same three readings on your blood pressure machine 3 days in a row. That doesn't happen very often, because humans are not so exact. Nature has a lot of variation. Just like in a card game, a player can draw 3 aces in a row from the deck on his lucky day. Machine readings are close to actual pressures, but the actual pressures may not be identical.