have you switched the light cycle to 12/12? some, if not most, strains, will show preflowers if you let them veg long enough; but if you put em into 12/12 that'll induce the flowering process. it can take anywhere from a few days up to 2 weeks for them to show signs of sex. typically males show before females, but like everything, not always. how big is your plant now?
and for flowering, you're going to want more than 32 watts..i used four 23 watts for 92 watts on one plant. and i wouldn't really want to try anything less than that.