Pn. Laila recently found out she is pregnant but suspects she may be carrying twins. There are several ways to determine if a pregnancy is single or multiple including: ultrasound to see multiple babies, Doppler heartbeat count to check for more than one heartbeat, HcG and AFP blood tests which may have abnormal levels with twins, and increased weight gain and symptoms compared to a single pregnancy. Identical twins are from one fertilized egg that splits, while fraternal twins develop from two separate eggs and one or two sperm. Risks are higher with identical twins that share a placenta and/or amniotic sac.