Transcript: Congratulations, you’ve hit the final stretch! Here’s what your sonogrammer will be looking for this month. By week 24, your doctor will be able to use a sonogram to determine how your placenta is positioned. In most pregnancies, it will be high in the top of the uterus. Sometimes, however, a placenta will be “low lying,” which can be a concern. That’s because, if the placenta does not move up from the bottom of the uterus, it can cover the cervix and make delivery difficult. This is known as placenta previa. During the last trimester of your pregnancy, a sonogram will also be able to determine which way your baby is positioned. This is important in the weeks leading up to pregnancy, as the baby should be resting with his or her head down. A sonogram can confirm that this is the case, and can also show if the baby is breeched, or lying feet first. During the last trimester, though, sonograms will mostly be used to determine that the baby is growing appropriately. However, if your delivery is overdue by a week or more, a sonogram can also be ordered to confirm the well being of your baby.