Pulse Sensor Showing BPM +150 and below 50

[ANJALI2022]

@biomurph Hello, I am using Sensor Playground Library. (Getting_BPM_to_Monitor code), I have pasted the code down below, as soon as I upload the code, I see the output in serial monitor is not stable, it keeps getting increasing like beyond 150 reaches till 250 or sometimes its below 50.
I have tried changing the threshold value, still no changes. I have gone through the already existing issues but it didn't really help.
I really need some help on this, Kindly acknowledge as soon a possible. Thanks!
`
#define USE_ARDUINO_INTERRUPTS true // Set-up low-level interrupts for most accurate BPM math.
#include <PulseSensorPlayground.h> // Includes the PulseSensorPlayground Library.

// Variables
const int PulseWire = 0; // PulseSensor PURPLE WIRE connected to ANALOG PIN 0
const int LED13 = 13; // The on-board Arduino LED, close to PIN 13.
int Threshold = 400; // Determine which Signal to "count as a beat" and which to ignore.
// Use the "Getting Started Project" to fine-tune Threshold Value beyond the default setting.
// Otherwise leave the default "550" value.

PulseSensorPlayground pulseSensor; // Creates an instance of the PulseSensorPlayground object called "pulseSensor"

void setup() {

Serial.begin(9600); // For Serial Monitor

// Configure the PulseSensor object, by assigning our variables to it.
pulseSensor.analogInput(PulseWire);
pulseSensor.blinkOnPulse(LED13); //auto-magically blink Arduino's LED with heartbeat.
pulseSensor.setThreshold(Threshold);

// Double-check the "pulseSensor" object was created and "began" seeing a signal.
if (pulseSensor.begin()) {
Serial.println("We created a pulseSensor Object !"); //This prints one time at Arduino power-up, or on Arduino reset.
}
}

void loop() {

int myBPM = pulseSensor.getBeatsPerMinute(); // Calls function on our pulseSensor object that returns BPM as an "int".
// "myBPM" hold this BPM value now.

if (pulseSensor.sawStartOfBeat()) { // Constantly test to see if "a beat happened".
Serial.println("♥ A HeartBeat Happened ! "); // If test is "true", print a message "a heartbeat happened".
Serial.print("BPM: "); // Print phrase "BPM: "
Serial.println(myBPM); // Print the value inside of myBPM.
}

delay(20); // considered best practice in a simple sketch.

}`