Despite recording a record home crowd in three decades, the Potters could only draw 1-1 against Brighton last Saturday. The stalemate ensured Stoke remained in the relegation zone.
After a two-week break, the Potters continue their fight to stay in the Premier League in two consecutive away fixtures at Leicester and Southampton.
But Lambert noticed the tightness of the situation in the bottom half of the table.
"From 10 to the bottom it's so close and if we'd got the two points we would have been up to 13 or something," he said.
"So we are well in the mix. The important thing for me is if you can't win a game, make sure you don't lose it.
"Since I've been here we should have taken more points than what we've got, but the level of playing and commitment, I can't fault them and can't ask any more.