When you have a stitch number that isn't divisible by 4 for a 2x2 rib, you can handle it 2 different ways: either k2, p2 across and end with k2, or you can k3, then p2 k2 across, with the extra knit at the end of the row. If this is going to be seamed, then you can decide which would look better after it's sewn up.
The main thing though is that you can't do the 2nd row the same way. The back of a knit st is a purl, the back of a purl st is a knit. After you do the first row, you need to turn your work and look at how the stitches appear. You would knit the knits and purl the purls, so if the next st facing you on the needle looks like a purl st you would purl it, and if the next stitch appears as a knit, you knit it. Do this on every row after the first one and you don't have to keep track of it being a RS or WS row. This also works for knitting ribbing in the round.