No problem at all! The pistils are white at first, then orange, and finally brown! That's normal! Your flowers are maturing! You are already in week 11 of growth and week 4 of flowering. To consider it ripe, it needs an average of 8-9 weeks of flowering! So we count 9-4=5. You still have 4 weeks to feed with nutrients. And 1 week (week 15) for the flush! At the end of week 15 - harvest! 👌 Good luck, bro! ✊😇