In the case of taking cold medicine without knowing the pregnancy, mainly according to the composition of cold medicine, the amount of oral intake and the number of weeks of pregnancy, etc. to decide how to deal with the common situation and treatment are as follows: 1, the drug composition has no obvious effect on the fetus: the composition of oral cold medicine instructions suggest that there is no obvious effect on the fetus, you can temporarily observe, regular pregnancy check-ups, while paying attention to rest and avoid staying up late; 2, the drug composition has Impact: 3-8 weeks of pregnancy is a critical period of fetal organ development, if the cold medicine contains morphine and other ingredients, early pregnancy may lead to embryonic development stopped, and even miscarriage and other situations. This situation needs to go to the hospital in time, the doctor will assess the treatment, if necessary, need to terminate the pregnancy, to avoid blind birth control, to avoid fetal malformation and other situations. If you have had unprotected sex before and have cold symptoms, you need to be cautious when taking the medication. You should first clarify whether you are pregnant or not, so that the medication will not affect the embryo development.