For women who have preterm miscarriage after pregnancy, they often need to take birth control pills for symptomatic fetal preservation treatment, and whether the birth control pills have any effect on the fetus depends mainly on the dosage and duration of the pills, and also has a great relationship with the specific type of birth control pills. If a woman is only taking fetus protection or vitamin E for symptomatic fetus treatment, it will not have any effect on the fetus, because fetus protection is a pure Chinese medicine preparation, and it is a drug that can be used by pregnant women, and it is not toxic, so it will not have any adverse effect on the growth and development of the fetus, and will not lead to fetal malformation and other problems, so it is a fetus protection drug that can be used normally during pregnancy. If a woman is taking progesterone capsules for fetal preservation treatment, it is also very safe. The progesterone soft capsules or drospirenone that are commonly used now are purely natural progesterone and have no adverse effects on the fetus. In the vast majority of cases, if there is still significant bleeding or persistent abdominal pain after the birth control, it is usually due to the poor quality of the embryo resulting in a superior performance, and there is not much need to continue the birth control, but to let nature take its course.