Medical Anomaly

The doctors came back and sat down with them to explain something they didn’t even know was possible. They told Jennifer that she had a bicornuate uterus. Jennifer remembers hearing that initial news and that her, “initial reaction was a bit of fear.”
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How Did This Go Unnoticed?

The most shocking part is that Jennifer already has a daughter, Millie. How did the doctors not realize this in her previous ultrasounds?