Hi Joy,
I don't really know what to say. I really don't understand why he isn't ordering an u/s. Could you go to the hospital that you will have the D&C at? I would go (- mid afternoon is a good time it is always quieter around school pick up/drop off). I would explain that you have had bleeding and are booked in for a D&C.
The reason a D&C is done is that retained tissue *can* cause infection to develop. However, given that you are bleeding and have been doing so for a while now this would seem unlikely.
I wish I could do more to help. I am really sorry that you are having to deal with this as well as the loss of your baby. :hugs: