I thought your beta was tomorrow! Fingers crossed for you that it goes well.
As far as wanting them to do more, like HCG shots or other measures... there isn't much more they can do if it has to do with something genetic. A chromosomal abnormality will miscarry regardless. But if it could be due to your thryoid and maybe that isn't quite as controlled as they think it is, it might be time to look for a new doctor. Or perhaps even seeing an actual Endocrinologist to get that under control in a hurry.