Help! I'm making a quilt that I found in the last Block magazine, sidewalk chalk. All went well sewing the strips together, I measured after stitching and they were the right size. Now that I have added the larger strip and cut out the triangles the squares are off size-wise. What can I do to rescue my quilt? Do I just square them all up to match the smallest square? I don't know what I did wrong and this isn't even my first quilt!