Usually, twins can be detected around seven weeks of pregnancy. During pregnancy, if you are carrying twins, the pregnant woman’s abdomen will be larger than a single baby and many indicators are different. When pregnant with twins, a pregnant woman needs to have an ultrasound, which can show two gestational sacs at 7-8 weeks of early pregnancy. Dissimilar twins have two sacs, while identical twins have both fetuses in the same sac, so you can’t tell if it’s twins until the babies have buds and a heartbeat. At around 13 weeks of pregnancy, identical twins can be detected through ultrasound, which can clearly show the halos of the two fetal heads, and the corresponding spine, trunk, and limbs can be seen. Pregnant women who are carrying twins need to strengthen their nutrition even more, supplementing with high-quality proteins, minerals, vitamins and other nutrients. If a pregnant woman experiences any uncomfortable symptoms during her pregnancy, she should seek medical attention immediately.