DaCapo Problem

I've not done much knitting on my DaCapo lately. The thing is; the gauge is wrong. It should be 25sts and 50rows = 10x10cm, but in my knitting it is more like 9x9.5cm. So I'm a bit worried that the whole thing will be too small. I've almost finished the back, but now I'm thinking of starting all over again. Not something I'm looking forward to, but better to do it now than to be sorry later....