positive DS screen risk

Katie
I had an u/s this week at 11 weeks 5 days. Everything looked great and I finally started to feel like this was actually happening! The NT test was perfect and the dr said to breathe a sigh of relief. We went ahead and announced our pregnancy to friends and family.
Today my dr called to say I got a positive screen of 1:191 for Down's syndrome. I feel so deflated and worried. She said the safe zone for my age is 1:350.
I'm currently sitting at a lab for my harmony bloodwork. Has anyone been through this?