If a woman’s period is delayed without coming, but she has symptoms of regurgitation and nausea, it may be a reaction to early pregnancy and needs to be ruled out. In addition, if you have recently eaten bad food, eaten raw and cold food, or have stomach cold, you may also have regurgitation and nausea, which are not necessarily characteristic symptoms of early pregnancy. If you have not done contraception when having sex after your period is completely clean, you must exclude unwanted pregnancy, especially if you have not done contraception during ovulation or the danger period, the probability of unwanted pregnancy may be a little higher. You can use a pregnancy test or early pregnancy test paper to detect pregnancy more than 10-12 days after intercourse, or you can go to the hospital to have a blood test for HCG, which is the gold standard for testing whether there is pregnancy. It does not mean that abnormal gastrointestinal symptoms such as regurgitation and nausea are necessarily symptoms of pregnancy, which is not a characteristic symptom of early pregnancy.