Hi
@TerpDerp! I would not worry at this stage. Potassium is mostly used during the flowering stage, considering you're growing in soil your medium is supposed to have enough nutrients (Potassium included) for the first weeks, and even maybe for the entire vegetative stage. Less is more. Remember it's always easier to fix a slight deficiency than to recover from a slight toxicity. Your plant looks healthy, just keep an eye on its coloration and growth speed, in case you see a deficiency coming. Hope this will help, keep us updated and happy growing! 👊