I have been trying and talking to people about going 12/12 from the go...maybe you've seen the thread...if not you should check it out......but the advice that I have heard so far, is that if you are going to have a veg period AT ALL....Three weeks is what you should shoot for as a minimum. So if you did a veg cycle and you are three weeke into it, flowering them now should be fine, yes, your plants will be smaller, but your buds will stilll be full and lush
Peace, Love and Tie Dye,
Mr. Bigglesworth
P.S. If time is a factor, like it is for me, you should try the 12/12 cycle from seed. I am still working on it for myself with the help of others. It seems to be going great so far