The precursors of monozygotic twins include rapid enlargement of the pregnant woman’s abdomen, pronounced early pregnancy reaction, drowsiness, and fatigue. Monozygotic twins, or monozygotic twins, are the result of the division of a fertilized egg. In a twin pregnancy, the abdomen usually enlarges more rapidly than in a normal monozygotic pregnancy, and there is a more pronounced bulge in the abdomen, which is larger than in a normal month of pregnancy. Early pregnancy reactions such as nausea, vomiting, breast tenderness and loss of appetite are more common in twin pregnancies than in singleton pregnancies. Significant drowsiness and fatigue are also common. It is usually difficult to determine monozygotic twins on your own, and pregnant women need to go to the hospital and under the guidance of the doctor for ultrasound, HCG values and progesterone values in order to make a definitive diagnosis. Compared with single pregnancy, twin pregnancy has relatively higher risks and more complications. After it is clear that it is a twin pregnancy, reasonable protective measures should be carried out under the guidance of doctors. You should pay attention to resting more in daily life, refrain from doing more drastic exercise, and go to the hospital for regular checkups.