Scan showed baby and yolk sack. Could it be twins?

The presence of two separate gestational sacs may indicate a twin pregnancy. However, it is important to note that an early ultrasound may not always be able to accurately determine the number of fetuses, especially if they are very early in development. Some factors that can affect the accuracy of an early ultrasound include the gestational age of the pregnancy, the equipment used, and the experience of the ultrasound technician. If there is any uncertainty or concern about the number of fetuses, your healthcare provider may recommend follow-up ultrasounds to confirm the diagnosis.