I was zipping right along when I finished up row ten and realized I was going to run out of yarn. Eek! There are mathematical consequences to using fatter yarn than the original pattern, though unwittingly, since I still haven't seen a skein of the Red Heart Bulky anywhere I don't know how much bulkier I went.
As you go around, you need ever more yarn for a single row. I looked at the skein in hand and thought it might make it, but it came up five spaces short. There was no graceful way to attach new yarn for that small bit, so I pulled it out, went to the store for more yarn, and did the row over. There was plenty of the white, and the green, but no red at all. I was able to order some directly from Lion Brand, but still don't have it yet.
I suspect I will still come up short for the 31 rows of the afghan, but, it is going to be lap sized and more pretty shortly, so I'll call it a lesson learned and be careful to have an overabundance of yarn any time I tinker with pattern requirements in the future. There is no doubt I will tinker, because more often than not I see a pattern and think it would look so much nicer in another color, or, in the case of the many British based blogs I follow, we don't have access to the gorgeous yarns and threads they have.