nutrient question

If i had a plant that vegged for 3 wks and has been on 12/12 for 2 weeks with no signs of sex would it be ok or a good idea rather to start my flowering nutes? Still growing like a weed. Pun. But no preflowers or pollen sacks or pistils. If anyone needs pics or more info let me know. Thanks.
 
I started the flower nutes the same time as the light switch.

1 week(or so) with flower nutes
10 days with that and 13/14 pk for stretch
Then switching the 13/14 with boost for...boosting until flush.
 
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