City were dominated for long periods at the Britannia Stadium, with Joe Hart making several saves and Jon Walters guilty of heading wide from close range.
The club have now taken just four points from their last three league games, a relatively inviting set of fixtures against Cardiff away and Hull City at home before the trip to Stoke.
However, the Chilean insisted that he was happy with how his side had fared.
"It was a very tough test," Pellegrini told Sky Sports.
"It's a difficult place to come, and it was also difficult because we have a Champions League game on Tuesday and had an international week. So it is a good draw.
"Players played with their national squads twice in a week. We have seven games in 21 days. That's why I think we played well.
"We wanted more chances to score, but if we had played like today against Cardiff we wouldn't have lost. Always we want to win but if we cannot win then we must make sure we don't lose."