The early stage of pregnancy is a critical period when drugs can cause damage to the fetus, even irreversible damage, so it is extremely frightening once discovered. In fact, not all drugs are teratogenic to the fetus. This situation first do not panic, take everyone to understand: 1, to see the composition of the drug, the instructions clearly state that most of the drugs prohibited for pregnant women have a relatively large impact, may have a certain risk to the fetus, the principle of medication is able to local not the whole body, a small amount of not a large number, so pregnant women try to choose a relatively small impact of drugs. The placental barrier can prevent some harmful large-molecule drugs from entering the fetal blood circulation, but there is no barrier for some small-molecule drugs, therefore, the effect of drugs on the fetus is still not fully determined in the scientific field, and requires dynamic monitoring. 2, the time and amount of medication, the time of taking medication occurs within 4 weeks of menopause, called the safe period, the results are all and none. At this time, the number of blastocyst cells is low, and once affected by harmful substances, the cell damage is difficult to repair, which will inevitably cause spontaneous abortion. If there are no signs of miscarriage, it generally means that the medication has not affected the embryo and the pregnancy can continue. It is not always necessary to terminate a pregnancy after taking the medication. You should communicate with your doctor in a timely manner, assess the risks and then make your choice, strengthen the examination and deal with any abnormalities in a timely manner, and without abnormalities you can have regular obstetric examinations.