The Cottagers take on Everton away from home on Saturday, with Pereira seeking redemption.
The Brazilian knows that when he missed a penalty at 1-1, he put his team in a tough spot for the rest of the game.
“It was a difficult game,” he told reporters.
“Coming back from the internationals, we wanted to – especially at home – make it our fortress and get points.
“I think we started well, unlucky goal against us. I missed a penalty and after that we had some pressure on ourselves. Second half we didn’t get things going like usual – a difficult day for all of us.
“That’s football, it happens. You only miss when you take the penalty, so it’s a responsibility that I accept.
“Of course, if there is another penalty or another chance, I will have to take it and step up to try and score.
“My head is very clear about that – we have to move on as quick as possible and give a big effort against Everton.”