Im so sorry for your loss. I had one at 12 weeks as well. Along with 3 natural miscarriages. The D&C was not that bad physically. It was much easier then the natural miscarriage I had at 10 weeks. I was put under, when I woke up cramped for a bit, but the bleeding and cramping weren't very bad and cleared up very quickly.
I had one at 12 weeks with my first pregnancy. I was put to sleep, which I was grateful for, and everything went well. It wasn't as painful, physically, as I had expected. Emotionally it was really hard, rely on those around you to help.
I am so sorry. I had one with my first pregnancy I was put to sleep and woke up sometime later and told that everything had been removed. I felt numb. Take as long as you need make any decisions x