Yes you should clone as preflowers do not indicate true flowering.

Some plants will show you before the 12/12 starts and taking some clones now will do wonders for you if she is good strain
HARDDON Reviewed by HARDDON on . What are these hairs? They can't be pistils because I'm 5 weeks into veg. But... wtf? 2/4 plants are showing this. Rating: 5