If you don’t get your period, you should first rule out pregnancy. You can go to the hospital or buy some test strips to determine if you are pregnant. If you are not pregnant, nausea and delayed menstruation may not have much to do with each other. You should consider whether it is caused by eating some unclean or indigestible food in the past few days. In addition to nausea, is there any abdominal pain, fever, etc. Sometimes acute gastroenteritis, cold and flu can also cause this condition. First of all, we should exclude whether we are pregnant, and secondly, whether there are any other symptoms in our body. If not, we can take some oral anti-emetic drugs and some oral drugs to promote gastrointestinal motility to improve.