Climbing

Well I have another repeat to show off. I didn't get 32 rows done yesterday - just 22, so 10 more rows this morning and I have to say I think I'm done with the lace for today. Anyone getting bored yet? - I know I am. The pattern is at least becoming a little more intuitive. I had made some preliminary calculations reckoning that I would be doing 16 repeats of the 32 row pattern + 8 rows. After measuring the slightly stretched out 2 repeats I have knit I reckon I'm kinda on course but the yarn!!!!!! I have already used 1/7 of the balls I have, which means I'm probably going to run short. Now part of me wants to rush in and get another ball but another part says wait, enjoy the thrill of possibly not having enough yarn - it will spur you on to knit faster!! I know it's crazy and I'm not contemplating the crushed feeling I'm gonna have if I knit up 14 repeats and can't get another ball in the same shade and lot no. What to do?