I've also seen 'pek' used before an adjective in place of 'çok' once in a great while. For example, Yediğimiz yemek pek güzel değildi ama karnımız çok acıkmıştı. (The food we ate wasn't very good/nice, but we were very hungry.) Native Turkish speakers, please correct if I am wrong =)

Peki means all right, okay, OK; well; well then Pek means very much, a lot, quite, fairly, rather, very

peki means its okay pek means too but we dont usually use pek