I have 5 indoor Durban Poison plants, 10 weeks post-germination, 3 wk seedlings transplanted and they have been vegetative for 7 wks. The seeds were not feminized and I had hoped to get any boys out based on pre-flowers before flipping to flowering. My feeling is to complete 2 more weeks of veg and if I still can’t determine sex, flip to flowering. Advice anyone? Thanks.
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Flip them. Boys will show before the girls so just keep a close eye on them for the first few weeks
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Agree with @Daddy the males will normally show first. I came out with 5 males and 4 females from my DP outdoor grow.
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You guys are right on the money 
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Flip to 12/12 and within 2-3 weeks you’ll be able to tell what sex they are. Remove the males carefully once you’re sure and you’ll be fine. Best of luck on the crap shoot!
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Thank you! Here on out, only feminized seed 
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Thank you! Here on out, feminized seed only
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It really is the best way. Bag seeds can be up to 70% boys 