The nausea that occurs after a woman’s intercourse may be caused by orgasmic stimulation during intercourse, or it may be that the woman has a stomach problem in the first place. If a woman has an allergic reaction to male semen, nausea can also occur. The symptoms of nausea have no obvious effect on the body, so don’t worry too much. If you have nausea after every intercourse, you may want to suspect that it is not a pregnancy reaction in early pregnancy, but nausea is not a unique symptom of pregnancy, you can not judge from the nausea symptom is not pregnant, it is recommended that women go to the hospital to improve the HCG test, if the HCG is significantly higher, it can be determined that it is pregnant.