Nute burn or deficiency?

Burnt? No. Overfed? Yes, see that dark green color? that's nitrogen excess. With that much soil, you should not need feeding in quite a few weeks. It is much safer to wait until you see some deficiencies before feeding and autos sometimes get enough from the soil without needing aditional nutes. also, those wavy leaves indicate too much water.

@Penguin I see your ph is listed at 6.8 That is too high and could be the cause of the slight calcium and magnesium deficiency I can see by the slight yellowing along the leaf edges. I suggest feeding calmag with ph adjusted to 6.4 and see how she looks after that Good luck with it mate and I hope I was able to answer your question

Yeah she is burned a little. If you are using a good quality soil you will only need plain pH adjusted water for around the first 3 weeks. She doesn't look too bad so she should recover pretty fast. I would adjust the pH of your water to 6.5 to make sure she can easily absorb the nutrients that are in the soil. And also be careful not to overwater. A plant that size doesn't drink much. Good luck