Dabkinganswered grow question 4 days ago How does the main stem feel? I see some wilting. Generally, wilting is due to OVER or UNDER watering. Nitrogen is a mobile Nutrient and a little bit goes a long way. N toxicity is possible, but not likely because most fertilizers only put a small amount in. As it doesn't take much for a N deficient plant to get it back to proper Nitrogen levels in one or two feedings only.
I would advise against flushing at this point in time. I would perhaps do a dry-back and let your soil dry out for a few days, then water slowly until run off. Post a follow up in a week and i'm sure all will be fine. It is possible that your plant got stressed as well, but marijuana is very resilient.