Please do go, and then share that you aren't ready to continue discussing that stuff "today." (Especially when you need to get through the weekend on your own.)

It's fine to feel safe for a while before delving into the tough stuff. I think your T knows this, and probably will be open to having a softer easier session tomorrow.

Therapy is for you. You are the only reason the T is there during that time: for you. So you can direct what you can and cannot discuss any particular time or day, and that's fine!

TC