High risk for down syndrome or trisomy 21

Hi mga ka-mommy! I hope someone can answer me sobrang nasstress at di ako mapakali. My first trimester scan result says that I am high risk for trisomy 21, sino po dito ang high rish for trisomy 21 pero paglabas ni baby normal naman? Sana po may makasagot 🙏🏻🙏🏻