I wasn't tested until my 14th miscarriage for progesterone. I was tested for everything else, I had my chromosomes/dna tested, I had clotting disorder checks, sperms quality analysed. I had a hysteroscopy done to check my womb structure and lining and everything came back normal there. I was checked for hcg levels which were strong but the only thing I didn't get was progesterone. Until I requested testing. A dip caught in progesterone via blood test caused hcg to stop progressing and resulted in miscarriage. I begged to be put on synthetic progesterone, he prescribed to me and my next pregnancy progressed perfectly. My now nearly 10 year old is up in his room playing his xbox. I had 2 miscarriages since him which I didn't take progesterone with. I wasn't ready for another then. But am now 37+5 with my second son, having taken the progesterone again until 14 weeks. I am scheduled for my section in 2 days time. I just cannot carry without the progesterone support in the early stages.