They have 2 weeks left? Or are 2 weeks old?
If they are two weeks old and you don't see roots in the drainage holes yet, you should be alright for another week or so. And yes, you will want to go to a bigger pot before the plant gets too crowded or you start to flower, but I like to let it get a good rootball in its first pot before I transplant it. Once I see roots in most of the drainholes, it's new home time. Good luck.