This looks like it may be a child's size. Just keep crocheting until it''s the size you want.
https://s3.amazonaws.com/spinrite/pdf/Bernat-SofteeBabyChunky-EndOfTheRainbowBlanket-ENG.pdf
https://s3.amazonaws.com/spinrite/pdf/Bernat-SofteeBabyChunky-EndOfTheRainbowBlanket-ENG.pdf