What is the effectiveness of Endometrin in pregnancy for a woman with a history of miscarriages?

The effectiveness of Endometrin in pregnancy for a woman with a history of miscarriages is not definitive. Studies have shown mixed results in whether it helps maintain a pregnancy in these cases. One meta-analysis suggested that the use of progesterone during pregnancy could reduce the risk of miscarriage by 47%. However, another study found that cervical cerclage was more effective than intravaginal progesterone.