Intuitively women may know if they are carrying more than one child. There are several ways for the couple to find out if they are carrying more than one child. The easiest way is to have an ultrasound done. Fetal heart sounds can also be detected by a Doppler system. This is the least accurate since you can detect the heartbeat in the abdomen. Severe forms of morning sickness can also be attributed to carrying more than one child. All women during pregnancy experience some form of fatigue, however women carrying multiples report feeling tired most of the time during the pregnancy.