i have heard that progesterone levels are important to sustain the pregnancy in earlier weeks,,have you tried progesterone supplements?
Progesterone is needed to help substain a pregnancy till the placenta takes over. If your levels are too low, generally your body will miscarry. I'm a little confused when you say 10k though as in most cases that would be 10,000 and I've never heard of levels that high. Did you mean something else? If your levels are indeed low, speak with your doctor and ask about them putting you on suppliments.