Cockroach poison pregnant women if only occasionally smelled, smelled a relatively short period of time is generally not harmful to the fetus, a long time to smell cockroach poison on the fetus may have a certain degree of harm. Cockroach medicine has the effect of killing cockroaches, there will be a certain degree of toxicity, divided into liquid, solid two forms, solid form of cockroach medicine odorless environmental protection, the impact on the pregnant woman is relatively small, sprayed in the air in liquid form of cockroach medicine on the pregnant woman is more influential, may enter the respiratory tract through the airborne transmission, and then through the respiratory mucous membranes penetrate into the blood circulation after the impact on the development of the fetus. If you smell cockroach spray for a short period of time during pregnancy, the effect on the fetus is relatively small, and then try to avoid contact with it as much as possible, and prolonged sniffing of cockroach spray may increase the chances of abnormal development of the fetus and miscarriage. After pregnancy, try to stay in a place with cleaner air and avoid contact with toxic and harmful chemicals to minimize the harm to the fetus.