I wouldn't worry about it. K and P have different tensions, and pieces will fall into a natural shape. Once the whole blanket is knitted, it will straighten out. You can also block it into whatever shape you want by wetting and pinning it, but I would wait to see what the whole blanket looks like.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry