Please help... How much pain is normal for an early miscarriage?

Lisa
I started miscarrying on Tuesday (it's now Saturday night).  I've been for two blood draws (and am scheduled for a third on Monday because levels were basically even between the two draws and hadn't dropped enough to fully confirm miscarriage).  I've had lots of blood with clots, and a lot of abdominal cramping since Tuesday.  I know that's all par for the course but the cramping has been fairly consistent since Tuesday and I'm starting to get nervous that it's ectopic (which is also why the doc wants to draw blood again on Monday).  Starting to wonder when I should really start to worry... Any tips? Or your own experiences to share that could be helpful?