I had a miscarriage around the 9th week, when the progestrone should be produced by the placenta. The doctor told me that the miscarrage could be due to a chromosomal defect. When i called the office to release the blood test result they told me that the HCG hormone was low, could the doctor had done something to save the pregnancy. I even mentioned that I didn't have morming sickness which is a sign of low progestrone level.