Signs of pregnancy with twins include more severe early pregnancy reaction, higher serum HCG level, more obvious uterine enlargement, earlier breast and nipple changes, different obstetrical examinations and ultrasound examinations, etc. 1. More severe early pregnancy reaction: In the early stage of pregnancy, if it is a twin, the early pregnancy reaction is often more severe in the clinic, with severe nausea, vomiting, weakness, loss of appetite and drowsiness, and it appears earlier than in a singleton pregnancy. The main reason is that the HCG level in the body rises more quickly after twin pregnancy than in singleton pregnancy, and mostly disappears on its own in 12-15 weeks of menopause; 2. The uterus will increase significantly: twin pregnancy will cause the uterus to increase significantly, and the abdomen will look bigger and grow faster in size than a singleton pregnancy in the same gestational week; 3. Higher serum HCG level: twin pregnancy secretes more HCG because there are two fetuses, and through 4. earlier changes in breasts and nipples: under the action of estrogen and progesterone, breasts will be significantly enlarged and accompanied by mild swelling and pain, and nipples and areolas will deepen in color around 35 days of pregnancy; 5. different obstetric examinations: uterus is larger than the number of weeks of menopause; multiple small limbs can be palpated in the abdomen in the middle and late stages of pregnancy; fetal head is smaller and disproportionate to the size of the uterus; two fetal hearts can be heard in different parts Two fetal heartbeats can be heard in different parts of the body; 6. Different ultrasound examinations: after 6 weeks of pregnancy, two primitive heart tube beats can be seen in the uterine cavity, which can also screen for fetal structural malformations and help determine the fetal position of the two fetuses; 7. Other: fetal movements appear earlier; women who are over 35 years of age or have a family history of twins will be more likely to have twins.