Oh wow... yeah that would be a pretty terrible awful moment to realize that you're talking to your regular T, and oops, you've just told her that you're T shopping!

I definitely think you should talk to her, or write to her, about your fears. Let her know that you do not want to leave, but that you're still scared that she's going to terminate you. This is a really normal fear for some of us - I had lots and lots and lots of talks with my current T about it, because I've got a history of bad terminations with not-great Ts.

If your T has any T-skills at all, she'll get it, and hopefully she can help you understand where it's coming from and maybe feel a bit more secure...

Good luck! And... you know... it's actually good that your session is coming up so soon! Much better to get the talk over with, rather than spending a whole week being nervous about it