So sorry to hear this
When I miscarried, I had bright red bleeding and sharp abdominal pains and went and got checked out by my gp. After doing a HPT & blood test, results the next day showed I had miscarried. I then let nature take its course, and had an ultrasound about a week or two later to make sure it had passed.
You will need to speak with your DW about how she feels, and what she wants to do. For me, miscarrying naturally was quite painful, not to mention emotionally as well. It took about 5 days before it had all passed.