I know that it's hard, but how will your T realize that you're so tired between now and Friday? Will you see or talk to before this? If not, then I'd suggest getting in contact with her to specifically discuss this issue. Waiting for her to do so could lead to a new disappointment, which could be magnified by how tired you're feeling (I always have stronger reactions when I'm so tired). Good luck! It's not too late to call.