Hello, I can understand your worry, but, I would like to say, the dosage you have taken is very little and also very early in your pregnancy. Hence, the chances of affecting the embryo are very minimal. Norethisterone can cause virilization of a female fetus when used in higher doses, if used at 7-8 weeks of pregnancy, as this is the time of organogenesis of gonads, where there is hormone sensitivity. It is a category D drug contraindicated in pregnancy. In view of these facts, you can decide on the future of the pregnancy if you can get the fetal DNA tests done to detect any malformations early enough. If no abnormal test results come, you can continue with the pregnancy with regular monitoring. Hope you find this information useful. Wish you good health.