The first trimester of pregnancy is accompanied by elevated progesterone levels and immunosuppression. Half of a child’s genome is the father’s, and if immunosuppression were absent, the mother’s immune system would recognize the fetus as a foreign body, leading to its rejection. During that period the organism is not able to adequately defend itself against pathogens, so it will primarily try not to ingest them at all. The evolutionary mechanism that compensates for the function of a weakened immune system is the emotion of disgust in a way that motivates behaviors to avoid all potential sources of infection. Pregnant women in the first trimester of pregnancy have a weaker immune system compared to pregnant women in the second two trimesters, and are therefore more susceptible to disgust and experience more frequent episodes of vomiting and nausea. The aim of this study was to examine whether there are differences in susceptibility to disgust in pregnant women considering the trimester they are in and whether pregnancy was planned. The study included a total of 1,050 participants (186 pregnant women in the first trimester and 864 in the second two trimesters; 849 pregnant women who were planning a pregnancy and 201 who were not planning a pregnancy) ranging from 15 to 44 years. The research was conducted using the Google Forms platform where participants first filled in sociodemographic data and then solved the core disgust, animal disgust and contamination disgust subscales. The results show that pregnant women in the first trimester of pregnancy are more susceptible to disgust compared to pregnant women in the second two trimesters of pregnancy.