i agree with redeft... don't do the d&c if you have a heartbeat. Like Kelly, and others on here, many have had a slow start and then improved....
let us know how your next us goes.
That's a toughy. That is really low, but could it have just started beating? Mine was 89 at 6 weeks and I was given a 50/50. A week later it was 125 and I am now 15w pregnant. I hope your baby is strong, please keep us posted (and stay off the net!)
Low heart rate is a danger sign but I've read many stories that had positive outcomes as well. Have the second ultrasound and I wish you all the best. Personally, I would not allow a D&C unless no heart beat was found.