(Suposably) Non-autos showing sex at 30 days, normal?

Hey everyone, I started some seeds a little more than a month ago and they all started showing there sex under 18/6. I know that's normal for autos but these aren't suppose to be autos and I was wondering if it's normal for regular seeds to sometimes show there sex after 3 to 4 weeks. I had some people tell me that it sometimes happens though i havt had it ever happen to me.. if u can shed some light on this is appreciate it..

sure, could be showing sexual maturity, time to flower if you're ready.
Dr Greenthumb shows flowering at 8 inches tall with his strains.

Yup mine do it

This varies immensely between strains with some showing pistils at 4 wks or less from emerging and others needing two weeks on flower schedule. Just happens that way.