This is your 1st grow?! It looks great. I see your slightly discolored tips, but in my opinion thats pretty common the further you go into flowering. If you're truly worried, then possibly flush and then add back the nutrients slowly, but i personally dont think you have too much to worry over. 7 weeks into flowering is pretty great, now she's just gonna plump up and color change...pistils etc.
Happy harvesting.✌️