The main signs of one gestational sac turning into two fetuses are more severe early pregnancy symptoms, larger abdomen, two fetal hearts, etc.
1. Early pregnancy symptoms are more serious: usually around 42 days of pregnancy, there will be early pregnancy reaction, manifested as dizziness, nausea and loss of appetite. In the case of a twin pregnancy, these symptoms will be more intense, and in the late stages of pregnancy, it is more likely to panic, breathlessness, and swelling of the lower limbs and other pregnancy symptoms.
2. Larger abdomen: If a gestational sac becomes a twin pregnancy, the pregnant woman’s abdomen will be larger than when pregnant with a child in the early stages of pregnancy, and the growth rate will be faster, and will exceed the size of the stomach in the normal months of pregnancy, which will be more pronounced after the 24th week of pregnancy.
3. Fetal heart more than one: If a gestational sac becomes a double pregnancy, with the increase of pregnancy time, even two fetal heart sounds can be heard. Two fetal heart waves with different speeds can be detected during an ultrasound examination at the hospital.
Once the diagnosis of twin fetuses is confirmed, the membrane nature of the twin fetuses should be determined, whether it is double chorionic and double sheep, single chorionic and double sheep, or single chorionic and single sheep situation, and according to the different situations to carry out the appropriate monitoring and treatment.