Yarn disaster

So i was happily knitting along on Linda's scarf when it suddenly dawned on me that i dont have enough of yarn to finish it. You see i wasnt happy with the original pattern, because i thought it was too narrow. So i have doubled up the stitches. Disregarding the fact that if i do that, I'd need double the amount of yarn. It didnt help ether that this particular yarn is discontinued and i had to order it online and hope that it will arrive before next week. Fool you say? Too right I say. But now i have started on the blue scarf and hoping it is gonna take me very little time to knit it.