A chance 1:100 means that there is 99% probability that your child does NOT have Trisomy 18. Those are pretty good numbers.
An amnio through placenta sounds scary... I did amnios twice (at 38 and 40), in a standard way, and I had some cramps afterwards. But, I had never tried for a child that long. If I were in your shoes I'd stay away from any invasion, ... - and would try to concentrate on the 99% of good news. Congrats!
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