First Grow: Always On My Heels

During the beginning of the week, I was still mostly focused on fixing that I had switched nutes mid-grow even thoughI knew it was a risk. Not having seen a nitrogen toxicity before, I kept monitoring to see if I had corrected it. Seeing leafier growth, I incorrectly assumed it was because of the nitrogen toxicity. Once I noticed the 3-leaf pattern that had been clearly growing for some time on EVERY plant, I did some googling. Quickly discovered that it's a telltale sign of reveg and now... how do I count the weeks?