Comb is small but getting red = roo???

[Toi-toi]

I have 6 of 7weeks old SS and they are sexed as pullets.
I just noticed today that some combs are getting red. Not bright, but bottom of comb is red.
But all of them are about same size of combs, no one has "really big and noticeable difference".
Is this some "flag up" sign???

I will upload pics tomorrow...

 

[SpringChickens]

You are probably safe. The females start getting a red comb about this age in some breeds.