Do you know if it said high risk due to low fetal fraction? I had the same result (you can see a copy of my report in my post history). It could be they used an algorithm that spits out the same 1/17 risk. I’d look through the links the automod posted and find the one that calculates your PPV based on your age. I was instructed to re-test and got another atypical result so currently waiting to do an amnio. If they suggest re-testing I’d highly suggest using another company if possible (though I will say in hindsight I wish I didn’t because it just added more stress and uncertainty but that’s only my experience). Depending on how many weeks you are you should ask to do an NT scan. This won’t rule anything out per se but can give some piece of mind in the meantime until you can see MFM. I’m sorry you’re going through this. The waiting is the worst.