Pale/ slightly bleached leaves on 5-6 days old auto seedlings. should i worry?

Yeah, if you're going to give us that much information, why not put it in a diary mate?! I don't see any problem at all with your little ladies... in fact, they look quite good! The temps are bordering on too hot but not much of a concern either. One thing you could do to increase the humidity is to hang wet towels in the tent... but you're not going to want it TOO humid when they go into flower. I also would not be concerned about the shape of the leaves... that's just some genetic differences going on and I swear, when they get the genetics of autoflowers down pat, they WILL compete with photoperiods! But then, you'll find some differences in seeds of photos, too.... Overwatering is the state of being consistently wet with no drying out... so if you gave them a little too much water, that's no big deal either - just make sure they dry out before you give them water again. In about a week or two, they'll start needing some nutes but go slowly with them - at first, only use 1/4 - 1/2 strength to see how well they tolerate them. You can increase from there but autos are rather notorious for not needing a whole lot... So far, so good! Congratulations on the ladies and good luck!