Each woman may have slightly different symptoms. But the most common symptoms of multiple pregnancy are:
Uterus is larger than expected for the dates in pregnancy
More morning sickness
Too much weight gain, especially in early pregnancy
Babies' movements felt in different parts of the stomach at the same time
Many women think they are pregnant with more than 1 baby. The healthcare provider may diagnose multiple babies early in pregnancy. This is especially true if fertility treatments were used. The provider may make the diagnosis with a health history, physical exam, and the following tests:
Pregnancy blood testing. Levels of human chorionic gonadotropin (hCG) may be quite high with multiple pregnancy.
Alpha-fetoprotein. Levels of a protein released by the fetal liver and found in the mother's blood may be high when more than one baby is making the protein.
Ultrasound. This is an imaging test that uses high-frequency sound waves to create images of blood vessels, tissues, and organs. Ultrasounds can be done with a vaginal probe (transducer), especially in early pregnancy. Or they can be done with an abdominal probe in later pregnancy.