Regular vacation refers to menstruation. The difference between premenstrual period and pregnancy is: symptoms, test results, etc. 1. Symptoms Some women may experience swelling and pain in the lower abdomen and both breasts before menstruation, mostly due to accelerated metabolism caused by stimulation of hormone levels in the body, and may also be accompanied by increased water intake and diet, irritability, and anger, and other symptoms. For pregnant women, the first symptom is menopause, and as the duration of pregnancy increases, symptoms such as nausea, vomiting, drowsiness, and breast swelling and pain occur due to changes in the body’s hormone levels. 2. Examination results For women with premenstrual period, the results of using pregnancy test or blood test for human chorionic gonadotropin are mostly negative. For women who are pregnant, a pregnancy test or blood test for human chorionic gonadotropin is usually positive. If a woman wants to accurately distinguish between a premenstrual period and pregnancy, it is recommended that the doctor make a comprehensive judgment after an interview, taking into account the woman’s specific condition and the results of relevant tests.