Colds produce a number of changes in the body, but they do not affect the maturation of the egg or the fertilization of the egg. Colds are usually upper respiratory illnesses and do not cause abnormalities in the ovaries or uterus. Fertilized egg implantation is the process of the fertilized egg binding to the uterine lining, which is affected by the lining of the uterus, the hormone levels in the body and other factors. Therefore, colds do not affect the fertilization of the egg. However, it should be noted that during the preparation for pregnancy, do not take medication at will after catching a cold, and take medication in strict accordance with the doctor’s instructions to prevent some drugs will have an impact on the implantation of the egg, and even affect the development of the fetus leading to miscarriage, malformation and so on. Also note that the symptoms of some viral infections are similar to those of colds and flu, and attention should be paid to differentiate them to prevent the impact on the fertilization of the egg or fetal development.