PHP login

The problem I'm having is that the line = header('location: loggedin.php'); is not bringing jumping to the loggedin page when I enter the correct Username and pword. Can someone see where my problem is?

   <?php
$error = '';
session_start();


//connect to db
$connectdb = mysql_connect("","","");

//select database
$selectdb = mysql_select_db("") or die ("Unable to select database");

if(isset($_POST['login']))
{
    $username = $_POST['username-input'];
    $password = ($_POST['password-input']);

    //Select Username and Password in the database
    $login ="SELECT * FROM Jobseeker WHERE (Username = '$username') and (Password = '$password')";
    mysql_query($login) or die(mysql_error());

    //check if user input matches the database
    $numrows=mysql_num_rows($login);

    if ($num_rows == 1)
    {
    $_SESSION['username'] = $_POST['username-input'];

    //Jump to loggedin page
      header('Location: loggedin.php');
    }
    else
    {
    header('Location: userlogin.php');
    $error = 'Error: Incorrect username or password';
    }
}
?>