Nausea on the tenth day of ovulation is not necessarily pregnancy, because only after the fertilized egg enters the uterine cavity and settles, the trophoblast cells begin to secrete blood HCG, and only when the concentration of the secreted blood HCG is gradually increased will there be a corresponding clinical response, such as nausea, vomiting, anorexia, etc. The symptoms of nausea and vomiting are not necessarily pregnancy, but they are the same as those of pregnancy. On the tenth day of ovulation, the fertilized egg has not yet entered the uterine cavity to settle, so the nausea phenomenon at this time may be caused by gastrointestinal diseases, it is recommended that the best to go to the hospital to do the appropriate examination, and also according to the clinical symptoms: whether or not there is pain in the upper abdomen; whether or not the normal bowel movements to give a comprehensive analysis, so that we can initially determine the nausea is due to gastrointestinal diseases or other causes of nausea. This is the only way to determine whether the nausea is caused by gastrointestinal diseases or other reasons.