Add custom links to menu targeted to primary menu

Hi there!

I would like to have two menus on my site: primary and secondary so i did:

add_action( 'after_setup_theme', 'register_my_menu' );
function register_my_menu() {
  register_nav_menu( 'primary', 'Header Menu' );
  register_nav_menu( 'secondary', 'Footer Menu' );
}

And then I added some things to menus by:

/* Login button */
add_filter('wp_nav_menu_items', 'add_login_logout_link', 10, 2);
function add_login_logout_link($items, $args) {
    ob_start();
    wp_loginout('index.php');
    $loginoutlink = ob_get_contents();
    ob_end_clean();
    $items .= '<li class="menu-item">'. $loginoutlink .'</li>';
    return $items;
}
/* "Mah profile" button */
add_filter('wp_nav_menu_items', 'add_myprofile_link', 10, 2);
function add_myprofile_link($items, $args) {
    if ( is_user_logged_in() ) {
        $profilelink = get_home_url() . '/zalogowany.php';
        $items .= '<li class="menu-item"><a href="'.$profilelink.'"> Mah profile</a></li>';
        echo $items;
    } else {
        echo '';
    }
}

But this code is adding those two links to both of my menus.
My question: is there a way to add those two links only to primary Header Menu?

PS. I’m still working on that, later I want to minimize it to just one filter.