The angle and frequency of these echoes allow for the creation of a live video feed image of the inside of the body. Please see the Fetal Medicine page for further information. What is a 20-week ultrasound Ultrasound imaging bounces high-frequency sound waves at body structures or tissues and detects the echoes that bound back toward the source of the waves. We weren’t exactly on the right side of statistics already, so it felt like a one to two percent chance was VERY likely. This comes with a 1-2 risk of miscarriage/premature labor.
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