Newly pregnant to the first premenstrual period may have similar symptoms to those before menstruation, but will not experience menstruation. This stage from the first pregnancy to the first premenstrual period is the stage of fertilized egg implantation. Due to the increase of human chorionic gonadotropin and progesterone caused by the implantation of the fertilized egg, it will cause a series of physiological changes in the mother’s body, such as nausea, vomiting, dizziness, fatigue, breast distension and pain and other symptoms of early pregnancy, which are similar to those before the onset of menstruation. However, under normal circumstances pregnancy will not be followed by menstruation, i.e. vaginal bleeding. Therefore, it is difficult to distinguish the symptoms of early pregnancy from those before menstruation, and pregnancy cannot be diagnosed by the manifestation of one’s own symptoms. A preliminary judgment of pregnancy can be made by taking a blood test for human chorionic gonadotropin HCG. If vaginal bleeding or severe early pregnancy reaction occurs in the early stage of pregnancy, you should go to the hospital in time for early treatment.