gimana cara membatasi gambar yg tampil di carousel hanya 3 pict?

misi mas , ada yang tau cara membatasi gambar di carousel , saolnya gambar yg ada di database pada muncul semua di carouselnya

 <div class="container">
<div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
  </ol>
<div class="carousel-inner" style=" width:100%; height: 400px !important;">
<div class="carousel-item active">
      <img class="d-block w-100" src="https://twistedsifter.files.wordpress.com/2016/07/dulmen_bornste_waldweg.jpg"  alt="First slide">
    </div>
 <?php
$stmt = $pdo->prepare('SELECT * FROM galeri ORDER BY id_galeri DESC');
$stmt->execute();

while ($data=$stmt->fetch(PDO::FETCH_ASSOC))
 {

  extract($data);
    # code...
    ?>
    <div class="carousel-item">
      <img class="d-block w-100" src="admin/image/<?php echo $data['image']?>" height="555" alt="Second slide">
    </div>

   <?php
   }  ?>

  <a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleControls" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

</div>
</div>