I've decided to cancel the appointment. It's too late to test my progesterone, at this point, and the nurse I bounce ideas off of says that with a chemical, it's almost certain to have been a chromosomal issue that caused the MC. The last one was also explainable because there was some IUD removal trauma. I'd probably just be wasting time and money to meet with a doctor at this point. If I MC next time, as well, then I may meet with a professional.