Pregnant women can occasionally smell mosquito coils, but do not smell mosquito coils for a long time in a closed environment. Pregnant women occasionally exposed to mosquito coils, the body’s immune function will play a role, the harmful substances produced by mosquito coils will produce resistance, if the body does not appear uncomfortable symptoms, which generally means that the body is not affected by the small, but if there is irregular vaginal bleeding, abdominal pain, as well as nausea and other symptoms, it is recommended that we go to the hospital as soon as possible to carry out a checkup. Mosquito coils in order to play the effect of mosquito repellent, will be added to the pyrethroid insecticide, organic fillers and other additives, if pregnant women are often exposed to mosquito coils, may affect the development of the fetus in the womb, is not conducive to the patient’s health. Pregnant women need to pay attention to the pregnancy test during pregnancy, in order to observe the development of the fetus, in the summer you can use mosquito nets to avoid mosquito bites.