Taking birth control pills estrogen is still low, if there are no other symptoms, and the low is not very serious, you can continue to observe. More serious, need to be given under the guidance of the doctor estrogen supplementation therapy, otherwise it is easy to lead to miscarriage phenomenon occurs. Low estrogen in early pregnancy will affect the development of the uterine lining, and a thin uterine lining will affect the implantation of a fertilized egg. After pregnancy, estrogen level is found to be low, but at this time there are no clinical symptoms, there is no vaginal bleeding and pain in the stomach, pay attention to bed rest, and continue treatment with birth control drugs. When low estrogen is found with a small amount of vaginal bleeding or pain in the stomach and symptoms of pre-eclampsia, estrogen supplementation, such as estradiol valerate, should be given under the guidance of a doctor. Low estradiol in early pregnancy requires medical attention.