I'd separate the two in one pot ASAP, in a week you may not be able to. The way I do it: first get another pot ready(fill at least halfway with new mixed soil whatever you use), take the existing pot, roll your hands on the sides slowly (makes it easier/looser to get the dirt/roots out of pot) flip over holding the stem and dirt; the whole dirt/root mass should slide out of the pot, carefully separate the two into halves (you're gonna break roots, just be careful)then repot them, give a little water with no ferts and watch em' droop for a few days, if you wait the roots are gonna be bigger and the plant is too, so now is the best time.

transplanting is *always* scary unless you've done it a 1000 times(I'm not to that point yet myself), again be careful!