question about white widow

Question is does w.widow start flowering on it own? I've had mine under 18-6 light schedule and have already started. Could it have been the recent cold snap? Should I just hit them with a 24hr light schedule until I'm ready to flower?
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No these are just preflowers. The plant hasn't actually started flowering until you change your light to 12/12. Read the grow faq, it will help you out a lot.

How early can you tell the sex of the plants. Mine are 31 days old. Some have these little things like small leaves sprouting from between the internode. How can I tell, If soon enough, Whether or not here male or female? What do I look for? Is this to early to tell?.............How do I post pics?