Clayx Identifacation and are all calyx's proof of female plant???

I have AF's and was concerned about calyx formation. Have never done AF's before and am assuming that it's no different from reg weed. I am about 25 days old with about 5-7 in tall with at least 5-6 nodes on ea plant. Any advice.

It'll form hairs or balls just like any other. Normally AF's show at 3-4 weeks!