Is this normal?

If you guys can see, the tips of the pistils are turning reddish brown, tomorrow will be week 3 of flower, I just feel like it's a bit early for it to do that, it's a single plant, and it's not hermie, I check and there's no signs, only thing I can thing of is when i water it maybe? Some water gets on the buds , or the light might be too close, not sure though, I'm using a 350w hps

first check your RH and temps at lights on and lights off.
make sure to feed correctly. Check your ph.
If the lights is hot to your hand at plant canopy
then its hot to the plant too. if all of those are fine
then relax, its maturing.