Quad screen positive for Downs

Hey ladies. My Dr called yesterday to let me know that my blood test came back with a positive risk for Down Syndrome. My chances are 1:160 and they have scheduled the Panorama test for next week (have to be 14 weeks and I'm 13 now). Has anyone else had this and further tests showed  negative? I've been reading that it gives false positives somewhat often but it's still hard not to worry. It's going to be a long 2 weeks waiting on results.