Why Pipeline Job is triggered although there is no change in SCM - jenkins

Question

I am setting up a pipeline job for my project and what I would like to do is to setup the job to ping to the SCM every two minites to check if there is change, if yes then build the job using pipeline script.
Here is my pipeline job configuration:
and the pipeline script:
pipeline {
agent any
options {
disableConcurrentBuilds()
}
tools {
maven 'Maven 3.6'
}
stages {
stage('Git Checkout') {
steps {
sh 'echo "Git Checkout"'
checkout([$class: 'GitSCM', branches: [[name: 'master']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[credentialsId: 'my-credential', url: 'my-git-url']]])
}
}
stage('Maven Build') {
steps {
sh 'mvn clean deploy -s $WORKSPACE/custom-config/settings.xml -Dsettings.security=$WORKSPACE/custom-config/settings-security.xml'
}
}
stage('Maven Build and SonarQube Analysis') {
steps {
withSonarQubeEnv('Sonar Qube') {
sh 'mvn sonar:sonar -Dsonar.projectKey=com.product:backend'
}
}
}
stage('SonarQube Quality Gate') {
steps {
timeout(time: 10, unit: 'MINUTES') {
waitForQualityGate abortPipeline: true
}
}
}
}
post {
failure {
mail bcc: '', body: "See ${env.BUILD_URL}", cc: '', charset: 'UTF-8', from: '', mimeType: 'text/html', replyTo: '', subject: "Build failed in Jenkins: ${env.JOB_NAME} #${env.BUILD_NUMBER}", to: "my.email#gmail.com";
}
unstable {
mail bcc: '', body: "See ${env.BUILD_URL}", cc: '', charset: 'UTF-8', from: '', mimeType: 'text/html', replyTo: '', subject: "Build unstable in Jenkins: ${env.JOB_NAME} #${env.BUILD_NUMBER}", to: "my.email#gmail.com";
}
}
}
Everything is working fine excepts that the job is triggered every two minutes although there is nothing changes in the master branch which I have setup in the script. Can anyone help me here to prevent this action. I would like the job to be triggered only when there is change in SCM. Thank you very much!