It is normal for some doubts to arise at that time between the embryo transfer and the pregnancy test. In general, we recommend trying to lead as normal a life as possible, following some recommendations, but trying to be as calm and relaxed as possible.
In the case of starting with cold symptoms, such as coughing and sneezing, it will not affect the implantation or the chances of achieving pregnancy. However, according to studies, in case of high fever, it can affect to a greater or lesser extent depending on the degree of temperature elevation, its duration and the stage of development of the embryo in which it occurs, and can range from not affecting implantation failure or early miscarriage.
Hyperthermia is not part of the side effects of hormonal medication or embryo implantation, so in case of suffering it, it is best to see your doctor to find out if it is an infection and put the appropriate treatment for it; as well as taking antipyretics such as paracetamol or perform physical measures in order to reduce body temperature and improve the symptomatology. Remember that in pregnancy there are certain medications that should be avoided, so the ideal is not to self-medicate and consult your doctor whenever you need it.