displaying an error msg in same page not in white one using PHP form

I have a form in index.php

            method="post" action="loginProcess.php">
 

             for="exampleInputEmail1">Email address

             type="email" name="email" placeholder="Enter email">

            
 

             for="exampleInputPassword1">Password
             type="password" name="password" placeholder="Password">

            

             value="Login">

as
you can see if I submit, it would go to
loginProcess.php

include_once
            "config.php";

 $email = $_POST['email'];
 $password =
            $_POST['password'];

 $sql = "SELECT * FROM users WHERE
            email='$email' && 


            password='$password'";

 $query =
            mysqli_query($connect,$sql);

 if($query){


            $row = mysqli_fetch_array($query);
 $rows =
            mysqli_num_rows($query);

if($rows ==
            1){


 $user_id = $row['id'];


            $_SESSION['id'] = $user_id;
 $_SESSION['email'] =
            $email;

 if($row['user_type'] == 1){

            $_SESSION['user_type'] = 1;
 header("Location: admin/index.php");

            }else{

 $_SESSION['user_type'] = 0;
 header("Location:
            user/index.php");

            }


}
elseif($_SERVER['REQUEST_METHOD'] ==
            'POST'){

 echo'
You provided
            wrong information. Please try
            again
';
}

}

I
inserted the bootstrap alert msg inside $_SERVER['REQUEST_METHOD'] to check if it is
submitted. However, the msg still appears in white page.