Symptoms of early pregnancy and premenstrual period usually include fatigue and drowsiness, breast changes and other discomforts, and the main difference lies in the different duration of the symptoms. 1. Fatigue and drowsiness: Usually early and early pregnancy and premenstrual, the patient will have fatigue and drowsiness, but early pregnancy lasts longer and is accompanied by the symptom of drowsiness. And the fatigue before menstruation is usually only 1-2 days, and can be relieved by itself after menstruation. 2. Breast changes: Generally patients may have slight swelling and pain in the breasts in early pregnancy, which usually lasts for a long time, while the color of nipple and areola will deepen and the area of areola will increase. And breast pain before menstruation is usually mild and can be relieved by itself after menstruation. If the patient has delayed menstruation, it is recommended to seek medical attention in order to rule out the possibility of pregnancy or other diseases.