Dear Grass Patch,
Sorry to hear that you are in this situation.
I have been told and did my research into the Oscar test that there are many false positives. How far along are you?
It depends on if you intend to keep your baby no matter what the outcome or result is, or is considering to terminate on medical grounds if your baby is really very sick. For the former, it doesn’t matter come what may, and the Oscar is enough because there are risks involved in the amnio or CVS, and hence it may not be worth the risk to go for more invasive testing.
If you are thinking about the latter, the only true diagnostic tests are the amniocentesis or CVS. With Harmony and other NIPT tests, a positive result would still mean a mother has to go through either the amnio or CVS to make a definitive decision and be absolutely sure. I’m guessing that’s why your doctor is recommending an amnio because it’s 99 percent accurate. But I understand your worry about the risk of miscarriage.
Do take care of yourself either way, and try to remain positive as stress will affect your little one too. Hang in there and take each test as one step at a time.