You're probably only doing one row on the RS or the WS side, or an extra one. How many sts do you have?
The pattern is -
RS row - k1 p1 and WS row - k1, p1, (both rows start with k1) then you switch -
RS - p1 k1 and WS p1, k1 (both rows start with p1)
Mark the RS row with a safety pin or tie a different color piece of yarn through a stitch.