Hello, I have gone through your query and understood the concern. As far as my knowledge goes, Primolut should not be prescribed as a progesterone supplement during pregnancy. This can cause virilization of a female fetus if used at the stage of organogenesis. It can also adversely effect the differentiation of the male sex organs. There are other, safer progesterone supplements like Duphaston, that can be used when needed. Please check with your doctor once again if the drug has been correctly prescribed or not. Since you are spotting, it is essential to take absolute bed rest, avoid all stressful situations and have regular follow up to know the pregnancy status. If the cause of the previous pregnancy loss can be known, it would be more useful. Hope this helps.