Bones disrupt ultrasound signals and make the picture harder to interpret. With your bladder full, your uterus rises out of the pelvis and can be seen more easily. The bladder acts as a window to look through to see the uterus and the fetus inside. The ultrasound vaginal probe, also called the transvaginal ultrasound, can be used in early pregnancy for a better view of the baby and placenta. A probe is placed inside the vagina, and the pregnancy is viewed from this angle.
Some couples ask for ultrasound to determine whether they are carrying a boy or girl.
If the baby is in a good position and it is old enough for the genitals to have developed and they can be seen clearly, determination may be possible. However, many doctors feel this reason alone is not a good reason to do an ultrasound exam. Discuss it with your doctor. Understand ultrasound is a test, and tests can occasionally be wrong. If you experience trauma during pregnancy, you may be taken care of by emergency-medicine personnel, trauma surgeons, general surgeons and your obstetrician.