WordPress: Get sticky posts

index.php

<?php
$sticky = get_option('sticky_posts');
$args = array(
    'posts_per_page'    => 6,
    'post__in'          => $sticky
);
$px_query = new WP_Query($args);
?>
<?php if(!empty($sticky)) : ?>
    <?php while($px_query->have_posts()) : $px_query->the_post(); ?>

    <?php endwhile; ?>
<?php endif; ?>
<?php wp_reset_query(); ?>