我只想列出我当前帖子的三个相邻（下一项）帖子项目

for my single template i have a related post section. for this section i just only want the adjacent (next) items of current post.(only shows the adjacent next items)

i just used the below code but its not worked correctly. its shows the current item as related item.

<?php
$next_post = get_next_post();
if ( is_a( $next_post , 'WP_Post' ) ) : ?>
  <a href="<?php echo get_permalink( $next_post->ID ); ?>"><?php echo get_the_title( $next_post->ID ); ?></a>
<?php endif; ?>

if my current item/post is week 08 then its shows week 09, week 10, week 11 as my related items. and if the current post is week 09 then it show week 10, week 11, week 12 as related items.(only shows the adjacent next items)