The numbers do not appear to be doubling like they should every 48hrs. There is quite a few days in between the rise. I have a feeling your dr. is concerned. I don't think the progesterone # is important right now. Yes they can test but it's not going to affect the outcome of the pregnancy if it is not healthy to begin with.
I am curious as to your Dr.'s thoughts on this. HCG levels have a wide range of normal, however in early pregnancy they are expected to double app. every 2 to 3 days. I would go with what your OB has told you though. Do you have an ultrasound scheduled? I wish you luck.