Flowering Plant. QUESTION

This isnt a big problem at all i am just wondering how come on my plant 4 weeks flowering and the tips of the pistils are turning red..? i fed it its first real dose of all the ferts a couple days ago if that has anything to do.? Just wondering why this may be.

mine started doing the same thing but they had too much P in the system so i had a lock out situation. i flushed started again with very little nutes again and i also was using floro's and i upgraded to a 400w hps and 24hrs later i had a bunch of new hairs and the buds definatly looked more plump.

im probably off seeing how you r in week 4 but pistil color changing is said to be the sign of ripeness of your bud when they change from white to brown them finnaly to a red that is when your plant is ready for a harvest but if just the tops are turning this color i would have to say without a pic that it is a light issue