Hopefully someone who has seen this can help. I guess I wouldn't worry if she's eating and drinking okay. Keep an eye on her, and hopefully it stops.
@cassie may have some better advice the next time she comes on.
If she's continuing to bleed than it may well have been a miscarriage. I personally have not seen this in any of my goats so I can't say for sure. Are you sure she was pregnant? Is she a polled goat? Do you have a buck running with her?