Twins are usually detected at 6-7 weeks of pregnancy. An ultrasound can determine whether they are twins by the gestational sac and fetal heartbeat, and it is recommended to go to a regular hospital for an ultrasound examination so that the test results are relatively accurate. If twins are confirmed, they need higher nutrition, so it is better to pay attention to nutrition during pregnancy, as poor nutrition will lead to small baby development. After the pregnancy is confirmed, you need to take folic acid supplement in time, which can prevent fetal malformation. Twins are prone to premature rupture of amniotic fluid and preterm delivery, so avoid overexertion during pregnancy and do not sit for long periods of time, but lie down to rest. In addition, it is also easy to cause anemia during pregnancy, so you need to have regular blood tests and take blood supplements reasonably.