Chelsea on Saturday dropped a point against Wolves after they were held to a 2-2 draw in a Premier League fixture.
With the result, Chelsea remain third with 67 points, four more than fourth-placed Arsenal who host Leeds on Sunday.
Lukaku put the Blues in front in the minute from the spot.
He increased the tally three minutes later after an assist from Pulisic.
Trincao beat the keeper from outside the box with the left foot in the 79th minute to bring the score to 2-1.
Conor Coady headed the ball from close range into the net in the injury time to level the scoreline.