Smelling asphalt for 5 minutes in early pregnancy may induce the onset of nausea, vomiting and other symptoms, and is therefore of some consequence. The digestive tract is prone to discomfort in early pregnancy due to the stimulation of progesterone. The smell of asphalt is an irritating odor, and under the stimulation of some unpleasant odors, it may induce an early pregnancy reaction, nausea, vomiting and other symptoms. Therefore, it is recommended to avoid contact with asphalt during the early stages of pregnancy to prevent the pregnant woman from experiencing discomfort and the fetus from being affected. If the pregnant woman smells the asphalt odor in early pregnancy and has obvious discomfort, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to improve the relevant examination, in order to promote the relief of discomfort.