Monitoring blood pressure

So I’ve been monitoring my blood pressure lately and I’ve been taking it 2-4 times at a time with 1-2 minutes apart from each other. My question is why do the numbers jump so much and which one should i trust? Here’s an example from the past couple days. I’ve also had instances where it’s been 140-155/80-93 but then falls to 130 range?

So I’ve been monitoring my blood pressure lately and I’ve been taking it 2-4 times at a time with 1-2 minutes apart from each other. My question is why do the numbers jump so much and which one should i trust? Here’s an example from the past couple days. I’ve also had instances where it’s been 140-155/80-93 but then falls to 130 range?