When you find out that you took cold medicine before you got pregnant, it depends on the time you took the medicine and the type of cold medicine you took in order to determine whether it will affect the fetus. If the pregnant woman is not clear about the situation, she can consult her obstetrician and not be too worried and anxious.1. If the cold medicine is taken before the last menstrual period of pregnancy, it usually does not have much effect on the fetus. Because the half-life of the drug is up to more than ten hours, after the end of menstruation in the ovulation period, the drug has been metabolized from the body, there is usually no adverse effect; 2, if it is in the ovulation period or after the ovulation of the cold medicine, if it is taking the western medicine category, such as antiviral cold medicines, there may be an effect on the fetus. However, most cold and flu medicines will not have serious effects on the fetus, except for the instructions which clearly state that they have toxic side effects on the fetus. However, in the case of proprietary cold and flu medicines, such as Banlangen Granules, the effect on the fetus is usually less and can be monitored dynamically through regular ultrasound checkups. Women need to pay attention to the use of medication during the preparation for pregnancy to avoid the situation of taking cold and flu medicines before finding out the pregnancy, which is not conducive to eugenics.