user_register hook fire jquery

Hey.

I use segment to track users behavior.
Now i want to track if user register a new user.

I try:

function new_user_register( $user_id ) {
    global $new_user_register;
    // store ID if i need it later
    $new_user_register = $user_id;

    add_action( 'wp_footer', 'new_user_script' );
}

add_action( 'user_register', 'new_user_register' );

function new_user_script() {
    global $new_user_register;

    echo "<script type='text/javascript'>
			analytics.track('registraion ', {
			plan: 'new',
			});
		</script>";
}

But don’t work.

Best Regards