Call to undefined method stdClass::count() in drupal 7

Call to undefined method stdClass::count() in drupal 7

I have an issue with a count function in drupal 7.
Code is :
$sql = "select count(Status) from TB_Aanmeldingen where (Status= 'Ja'
or Status='Ja, met kleine') and ID_Wedstrijd = :match";
$args = array(':match' => $match);
$row = db_query($sql, $args)->fetchObject();
$aantal = $row->count(Status);
Error message:
Call to undefined method stdClass::count()
Any help is very much appreciated!