It is normal to feel like you are about to have your period, only to find out that you are pregnant at this time. In the first 1-2 days of menstruation, some women will have symptoms such as swelling in the lower back and abdomen, soreness, fatigue, and lack of energy, which are similar to the physiological abdominal discomfort that occurs in the early stages of pregnancy. As long as you and your fetus have no abnormalities in the early pregnancy test indicators, it is normal. Menstruation refers to the cyclic shedding and bleeding of the endometrium that occurs along with the cyclic changes of the ovaries (once a month, a common cycle of about 28 days), and under the regulation of estrogen and progesterone, the endometrium exhibits proliferative, secretory, and menstrual phases. The menstrual phase is what we call the days of menstruation, usually 3-5 days, it is the final result of the withdrawal of progesterone and estrogen. Generally there are no special symptoms during menstruation, but due to the elevated level of prostaglandins in the body during menstruation, which promotes uterine contraction and congestion of the pelvic organs during menstruation, some women will experience discomfort in the lower abdomen and lumbosacral region or painful uterine contraction pains and may experience symptoms of gastrointestinal dysfunction such as diarrhea, and a few patients may experience headaches and mild neurological instability. Most women in the early stages of pregnancy will appear due to pregnancy caused by physiological abdominal discomfort, which is a normal physiological phenomenon, due to the early embryo bed, the uterine ligaments are pulled, the body’s hormone levels lead to changes in the body’s metabolism to speed up the body may be induced abdominal pain. Often manifested as a short period of time, both sides of the lower abdomen pain, aggravated by exertion, can be relieved after lying down and resting. At this time, pay attention to maintenance, prevent cold, eat less sour and spicy food, can effectively regulate abdominal discomfort. If the pain is prolonged, gradually aggravated, or accompanied by a little vaginal bleeding, the possibility of ectopic pregnancy or preeclampsia cannot be ruled out, and it is necessary to immediately go to the hospital to repeat the blood test for HCG (human chorionic gonadotropin), and ultrasound to make a clear diagnosis.