If you take cold medicine before finding out you are pregnant, it depends on the time you take the medicine and the type of cold medicine to determine if 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 menstruation of pregnancy, it usually will not have much effect on the fetus. Because the half-life of the drug is more than ten hours long, after the end of the menstrual period of intercourse, the drug has been metabolized from the body clean, generally will not have adverse effects; 2, if the cold medicine eaten during or after ovulation, if it is taken in the Western medicine category, such as antiviral cold medicine, it may have an impact on the fetus. However, in addition to the instructions clearly have toxic side effects on the fetus, most cold medicines will not cause serious impact on the fetus. However, in the case of Chinese cold medicines, such as Banlangen granules, they usually have less effect on the fetus and can be monitored dynamically through regular ultrasound checks. Women need to pay attention to their medication during pregnancy preparation to avoid the situation of taking cold medicine before finding out pregnancy, which is not conducive to eugenics.