AsNoriuanswered grow question 3 years ago Nitrogen toxicity. Your plant not fine, but in such early stage, you can save it without huge step back.
Slow down , no nutes for 3-4 waterings and after reduce N in your feed, or downgrade quantity for 50%. Plargon is very strong, in my mind created for lawn weed, not ours.
PK is your target, from 6th week of flowering, you should stop all Nitrogen and carry PK for few weeks max after.
Good luck !