Babies with Down Syndrome: How and when did you find out that your baby had down syndrome?

Down Syndrome babies run in my husbands family. My sister in law told me that when she was pregnant with her daughter she barely felt her baby move. She said she had all kinds of test done and Dr's never detected that her baby had down syndrome till the baby was born. Im 5 months pregnant and I barely feel my baby move too. Could this mean something could be wrong? I know all babies are God's gift and if God gives me a baby with down syndrome I would love it just as much. But just the anticipation of not knowing is making me anxious. What were your feelings when you found out your baby had down syndrome? How and when did you find out? What were your symptoms when you were pregnant? Thank You.