Trinidad played the entire second half with 10 men after Avery John had been red-carded for a crude lunge at Christian Wilhelmsson but the islanders, the smallest nation ever to qualify for the finals, held on with goalkeeper Shaka Hislop making a string of fine saves.
“We thought we would win, we had plenty of chances, they just did not go in today, that’s the way it goes sometimes,” said Ljungberg.
“We lost patience but if we had had some luck, we could have won 4-0. I think it’s positive that we had chances.”
Coach Lars Lagerbäck also admitted that 37-year-old Hislop, who replaced first choice Kelvin Jack who was injured in the warm-up, was the difference.
“The result was very disappointing,” said the coach.
“The lads played well but the Trinidad goalie made some great saves. We are in a tougher situation than we hoped we would be facing before the match.
“We had some great chances, but failed to capitalise on them. This happens sometimes in football.”
Trinidad’s wily coach Leo Beenhakker, once in charge of mighty Real Madrid, admitted that the Swedes were unfortunate.
“Ten against eleven is hard,” said the Dutchman.
“I recognise that Sweden had the better chances, but when you compare the two forward lines, then I am very happy and proud of the point we won.
“It was a great performance by us.”
Both sides have matches against England and Paraguay to come.
England currently top the group after beating the South Americans 1-0 earlier in the day in Frankfurt.