I am not good about knitting swatches. I am making this sweater
http://www.knitpicks.com/On+Deck+Pul...D50561220.html for my daughter. The pattern says that the gauge should be 18 stitches/28 rows = 4" over St st on us 8 needles. My swatch was 4" wide but 4 1/2" tall. What should I do to adjust? Thanks for the help!