I had miscarriage a week ago and d&c after that. When can I get back to exercising abdominalsand my back?

As you can tolerated. If you r not having much pain or bleeding, you can go about and pretty much do anything you want. It has been a week and so you should be fine at this point. If u r still having pain or excessive bleeding, then don't force it. Check with doc if too much pain/bleeding still because of possible infection!.. Good luck to you!