Hello, In view of your previous history of unhealthy pregnancies, the possibility of hormone defects as a possible cause should be considered. Thus, you have a possible need for progesterone supplementation. Vaginal supplements are better than oral medication in order to avoid side effects. Your doctor is the better judge on the need of the dose. Regular follow up with a clinical exam and sonogram should be helpful. Please take a healthy diet, adequate rest and avoid stress. Hope this helps.