If a woman takes cold medicine before pregnancy or in the early stages of pregnancy, it will not affect the fetus too much. Because when the egg and sperm combine within a week, at this time the fertilized egg has not been planted on the endometrium, it will not be affected by the drug; if the drug is used within 1-2 weeks after fertilization, although the fertilized egg has been successfully implanted, but there is no tissue differentiation, the drug will not lead to fetal deformity, but will only cause a miscarriage, so if there is no miscarriage during this period of time, there is no need to worry too much. However, in the 3rd-8th weeks after the fertilized egg has been laid, at this time, the embryonic organs begin to differentiate and form, and are very susceptible to the influence of drugs and external factors, and if you don’t pay attention to the use of drugs at this time, it will easily lead to fetal malformation. Therefore, women who suspect that they are pregnant or clearly pregnant, the use of drugs must be under the guidance of a doctor, do not use drugs without authorization.