alright rookie mistake right there planting in the same pot but we live and learn, what i would do is since the roots havent grown much take a few peices of hard plastic, like the cover to a school binder or sumthing, but make sure its thin, and stick the plastic in the dirt all the way to the bottom of the pot to section of the 3 plants, since theres hardly ne roots yet u shouldnt have to worry about crushing the roots w/ the plastic, dnt put the plastic to close to each plant tho, after ther sectioned off evenly let them grow and get a good root ball growing on them, the dividers will prevent your roots from growing together, after a few weeks transplant them in to separate pots, when putting the plastic in i would hav the soil moist or wet so it goes in easy. but watch so u dnt disturb ur soil or ur plants to much