Yeah, just chill! It's nothing to worry about, just a sign that the plant is getting as much light as it needs, and even more. You can try to put it in a more shaded area, if you want, and then you'll se, in a week or a couple of weeks time, that it will turn more green and the blush will disapear!
Some varieties might get this blush more often then others. The pink varieties. The albas and Blue lip's doesn't tend to get red leafs. Thats my experiense. Pardon my very, very badbadbad...english