Women with delayed menstruation and symptoms of nausea and vomiting may be the phenomenon of pregnancy or may be caused by gastrointestinal disorders, as follows: 1. Pregnancy: The first thing is definitely to exclude unwanted pregnancy, if women have sex after their last menstrual period is clean, without good contraceptive measures, there is a possibility of pregnancy. Generally, more than ten days after intercourse, you can use a pregnancy test or go directly to the hospital to draw blood for HCG testing to determine the presence of pregnancy. If the pregnancy test is positive, you can go directly to the hospital to take a blood test for HCG, combined with ultrasound to determine intrauterine pregnancy or ectopic pregnancy, or to determine the early stage of pregnancy. 2. Gastrointestinal disorders: If pregnancy is completely ruled out and there is a delay in menstruation, and there are symptoms of nausea and regurgitation, this situation may be caused by gastrointestinal disorders. A woman’s recent irregular diet, frequent late nights or unhygienic eating may increase the burden on the gastrointestinal tract, causing nausea and vomiting. Generally, the delayed menstruation is caused by endocrine disorder. You can go to the hospital for ultrasound to see the condition of the uterine adnexa and the thickness of the endometrium, as well as blood tests for the six endocrine items.