I am 17w along and received a telephone call from my doctor today informing me that my blood test came back abnormal and that I am considered at risk for a child with Downs. Background: I am 31 (will be 31 when baby arrives), and had a fairly uneventful pregancy with twins who arrived in September 2013. I say fairly uneventful because the only issue was going into preterm labor at 33w, but then held those suckers in until I chose induction at 36w 3d because I physically couldn't carry them anymore without feeling like my skin was ripping open. After four hours of pushing, my daughter's head was kinked and I had to deliver via cesarean.
My doctor informe me that my tests showed a 1:159 chance of DS. I knew something was wrong because it took FOREVER for the results to come back, plus I have just been having an off feeling this pregnancy. I'm super sick, which I wasn't with the twins, but I just feel different. Probably just a different go at this pregancy thing, but I can't help but feel spooked. I am going in for additional bloodwork tomorrow, but unfortunately its a Friday which will add even more delay to hearing feedback. I know that it doesn't matter, but my paternal uncle has DS, so its weighing on me particularly hard.
Anyone else have a similar experience and then go on to have a child born without abnormalities? I am making myself sick thinking about this.

Re: Concerns after second Sequential Screening
ETA - what type of test was done on Friday? I believe only an Amnio or CVS can confirm with certainty in utero while blood tests are speculative? I may have that wrong though.
I had the Panorama done, its supposedly 99% as another screening, but not diagnostic. Fingers crossed!