I doubt it will bud automatically unless it is a cross of sativa/indica & ruderalis. Those are the only auto bloom plants I know of. Most likely you have a plant that has been in 12/12 for @ least a week & is just now beginning to show signs of its sex. My advice is to continue the 12/12 & you will know very quickly if it is male or female. The only other reason would be that it is a clone of a very old plant. I have clones of Chemo that show hairs @ every node, even with 24/7 lighting. They will not bloom under those conditions, but they will continue to put out a few white hairs.

How old is it? Plants show preflowers at around 6 weeks from seed. Clones can shoot preflowers everywhere. Just because you see hairs, doesnt mean it is flowering. Clone away!

Every clone that I have shows some type of preflowers in veg its no big deal.