Down syndrome

Hey everyone I was just curious what everyone's opinion was on getting the test to see if your baby has a higher risk for Down it just a blood test? Around 12 weeks? Is it true it causes higher risk for miscarriages? I had my first child almost 9 years ago when I was 20, but I don't recall them even asking me about this test was it because I was so young and it's an age factor? Thoughts?