The Royals kept back-to-back clean sheets in their previous two matches picking up a point against Swansea on Boxing Day and three against West Ham on Saturday.
Pearce said: "I certainly think so. We were very good against Man City defensively, very good against Swansea defensively and very good against West Ham defensively and we had that little bit more going forward.
"But we had to get it right at the back first, build from the back and we are doing that and now we are grinding out the wins."
He added: "Players and staff want to keep clean sheets and we are happy with the last three games we played. We deserved a clean sheet at Man City, we then got two clean sheets and we are building on that.
"We got a win and we are building on that. We fully believe we can get out of this, everyone has written us off, everyone is saying we are down but inside that dressing room we have a firm belief we will do it."