Hello dear Understand your concern Duphaston contain progesterone hormone supplements. It is used to maintain pregnancy in low progesterone pregnancy, help in fetal growth and prevent the miscarriage. Because of progesterone it make the uterine environment more favorable for fetal growth. So your pregnancy may be risk for low progesterone according to your doctor, that s why he gave you duphaston. It is completely safe and continue according to your doctor advice with regular follow up for fetal growth. Take healthy diet, lot sof fluid, prevent exertion and adequete rest. Hope this may help you Best regards Dr. Sagar