No that is the healthy part. Looking good though! Good job getting started!!!
The bigger leafs with edges curled down and being too dark of green is less healthy. Cannabis is a bright vibrant green. Not that the over done nitrogen is that bad becasue it aint bad... and the plant will not slow down on that account. That is a minor overdosing that wont matter and the rest of the plant will never remember unless it continues.
That said you are not far from likely being root bound ...if you grow it fast. That may cause a long list of problems. Are you planning to bloom in that pot?
If you have a decent mix in there, in the right sized pot, then you should not need to add much more than water until bloom, if the pot is sized correctly. That plus silica, maybe some cal / mag depending on the water situation. And if you are running a great soil some molasses product for the microbes.
But you can also run soil mixes that run out of nutes in days and then need to be constantly feed.
Some people mix up stuff in the soil that is recommended for other plants but not for cannabis.
You are likely somewhere in between.
Anyway what you are asking about is just growing fast and not enough chlorophyll built up yet. Take a look at it tomorrow and I bet it looks healthy.
Almost time to top it it looks like?