Have you pitched the yeast? I would boil the additional 2 gal, cool it as quickly as possible and add it. As long as it is sterile it won't hurt anything. Or you just have less beer of not quite what you wanted.
Doritos are evil. Taco Bell is evil. Ergo, Ginger is Satan. - Shecky
I should have known the thought of Ginger's wang flopping would be enough to kill the TR. - KCBrewer
Ginger is famous? - TXCrash