Harmony is a DNA profiling of the baby and will throw up chromosome disorders (Down’s syndrome, Edwards syndrome and Patau’s syndrome)
There is DNA of the baby in your blood and they can screen it. It's a fairly new test developed in USA
The NHS hope to one replace the NS scan and bloods they do with it as it's risk of False positive is about 0.04% , so people the don't go on to do invasive tests like CVS and risk losing baby's
But it's too expensive for NHS at the moment
You also find out the sex if you want as that's revealed as part of the DNA profile
It's pretty much a full proof testing.
I had a early Seanad had stabbing pains in my side so doctor thought pregnancy could be ectopic , when they scanned they found a cyst which is causing the pain
They will just keep a eye on it
Normally you won't get a scan till 12 weeks all being well.