Chemdog First Grow (Micro PC Grow)

Hi growers, its week 3 with my chemdog here. The plant hasnt grown much, probably as tall as Zippo lighter and the leaves is also very small. It's probably due to the bad soil quality and lack of aeriation inside the medium, so ithink i might transplant her to a slightly bigger pot with new medium soon. And i think she still looks happy apart from growing so small :D I have a couple question here to all growmies here: 1. Is it okay if i change the medium to Coco coir/peat mixed with perlite with 50/50 ratio at this stage of the grow? Or should i just leave it in soil? 2. Should i just toss her out and start over or leave it for a couple of weeks and see how it goes? Happy Growing Y'all, Peace -DrSKAB