The discovery of pregnancy after taking many drugs requires a comprehensive consideration of many aspects. The teratogenic and toxic effects of drugs on the fetus depend on the nature, dose, duration of the drug, the stage of embryonic organ development and the sensitivity of the embryo and fetus individuals to the drug. The 3-8 weeks after fertilization is an important stage of embryonic development, which is most susceptible to the effects of drugs and the environment. 5-10 weeks of pregnancy can be considered as an extremely dangerous period for drug use if calculated according to the time of last menstruation. If you take a lot of drugs that are contraindicated for pregnant women during this period, the side effects to the fetus are relatively high and the probability of teratogenicity is also relatively high. If you want to keep the fetus, it is recommended that you should do the routine maternity checkups and teratology tests. If abnormalities are detected at a later stage, the pregnancy should be terminated.