What is post type of Replies in Wordpress BBPress? - sql

Question

I did count active in 7 days topics of my Wordpress page. But It counts only Active (replied) topics not actual replies- I need more dynamic number to lure people using forum.
function count_new_forum_posts() {
$today = date("Y-m-d");
$date2 = date("Y-m-d", strtotime($today . "-7 Day"));
$args = array(
'post_type' => 'topic',
'meta_query' => array(
array(
'key' => '_bbp_last_active_time',
'value' => $date2,
'type' => 'DATE',
'compare' => '>='
),
)
);
$posts_query = new WP_Query($args);
$the_count = $posts_query->post_count;
return $the_count;
}
add_filter('wp_nav_menu_items', 'new_forums_notice_to_menu', 10, 2);
function new_forums_notice_to_menu($items, $args) {
if(count_new_forum_posts() > 0){
if( $args->theme_location == 'primary' )
$items .= '<li><font color="red">Šios savaitės naujos žinutės forume: <span>'.count_new_forum_posts().'</span></font></li>';
return $items;
}else{
if( $args->theme_location == 'primary' )
$items .= '<li><font color="gray">Šią savaitę forume dar niekas nepasisakė</span></font></li>';
return $items;
}
}
When i try to change post_type to 'reply' or 'replies' It counts to 0.