Dude, your plant is very small for the age. If I were you I would start again. Take it as a learning experience. If you feed your plant properly, it will grow to that size in a few weeks.
Pop another seed. Feed it in the second week, start at half strength (You can get a Biobizz feeding schedule off of the internet). Increase feed until your at full strength and go from there.
By the way its kinda hard to nute burn a plant using organics, as long as you don't just poor loads in then you won't have a problem. I advise starting off with 1ml/l second week. 2ml/l for a few feedings and then to 4ml/l
Goodluck buddy