WordPress loop with new. args for else

I would like to show posts in a custom post type with the category ‘pin-post-to-homepage’, then if that doesn’t exist then display posts from a different post type.

Below are the arguments. Feel like I am very close, as the first query works when a post has the category, though the second loop isn’t working at the moment. Are the args added to the else correctly?

Here is my code:

    <?php
    $first_args = array( 
        'post_type' => 'timeline', 
        'posts_per_page' => 1,
        'tax_query' => array(
            array (
                'taxonomy' => 'pin',
                'field' => 'slug',
                'terms' => 'pin-post-to-homepage',
            )
        ),
    );  
    
    $second_args = array( 
    'post_type' => 'days',
    'posts_per_page' => 1,
    'orderby' => 'rand'
    );      


    $first_query = new WP_Query($first_args);
    if ($first_query->have_posts()) {
        while ( $first_query->have_posts() ) {
            $first_query->the_post();
    ?>

        <?php get_template_part('partials/andSoOnTimeline'); ?>

    
    <?php
        }
    } else {
      $second_query = new WP_Query($second_args);
      if ($second_query->have_posts() ){
    ?>

    

        <?php get_template_part('partials/days'); ?>


<?php
    }
 }
?>

Answer

Try something like this

$first_query = new WP_Query($first_args);
$has_results = false;
if ($first_query->have_posts()) {
    $has_results = true;
    while ( $first_query->have_posts() ) {
       $first_query->the_post();
       get_template_part('partials/andSoOnTimeline');
    }
}
wp_reset_postdata();
if ($has_results === false) {
    $second_query = new WP_Query($second_args);
      if ($second_query->have_posts() ){
          //Update line below since first post
          $second_query->the_post();
          //...
      }
}
wp_reset_postdata();