It is normal for women in the first trimester of pregnancy to have sexual reactions due to some external environmental stimuli, and as long as they are properly adjusted and controlled, there will be no significant effects. In theory, sex is not allowed in the first trimester of pregnancy, and sexual stimulation is avoided as much as possible, because the process of sex or sexual stimulation can easily cause contractions of the uterus. In the first trimester of pregnancy, the gestational sac is unstable, and if the uterus contracts abnormally, it can easily cause symptoms of pre-eclampsia, but it is not a problem as soon as the stimulation occurs, it is only a matter of probability. Therefore, if there is a certain sexual reaction, but there is no obvious abdominal pain or abnormal vaginal bleeding, it will not have a direct impact on the growth and development of the fetus, so try to pay attention later in life to avoid the occurrence of sexual reactions.