Pompey are back in the relegation zone having failed to win any of their last 10 matches, but they have managed three consecutive draws following a miserable run of seven straight defeats.
They now have a great chance to pick up an elusive win to set them up for Christmas when they head to bottom-of-the-table Hartlepool next weekend.
Whittingham said: "We know we're in a fight and will scrap for every point we can get.
"It's a crucial period for us. The matches come thick and fast and we have to collect a decent amount of points from these upcoming games.
"But anybody who comes to the training ground can see that the atmosphere around the place is positive."
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