@BecsterG after my previous loss and the fact it's twins, I wanted to find out as early as possible about any possible anomonly's. It's also a blood test taken from you which contains the babies dna so is 99 percent accurate. Where as the NHS test is not very accurate as it just factors in your age and doesn't actually test the baby other the the nucal measurement.
It's all a personal thing really and it boils down to whether you would continue with the pregnancy or not. If you would then the nipt/harmony is pointless. But for me I know I would not.
I'll definitely get a 'low' score on my NHS test because I'm 33, but I could still have a baby with any of the sydromes they test for as their test is only 80% accurate. Though obviously those conditions are likely to be picked up at a 20 week scan, I under no circumstances wanted to get to 20 weeks and then have to terminate my pregnancy at that late stage.
I have two other children so they are a total factor in my decision to get the Harmony test. And it only tests for down syndrome, pataus, and Edwards.
The NHS only send you for one through them if your chances are 1/150. In France for example they send you even if your chances are 1/300.
It's just too much of a gamble for me to rely on there testing system, even though chances are so low. People obviously still give birth to babies with down sydrome who had the NHS test and it came back low risk, and nothing was picked up.
I think you can still probably have it of your worried but as your so close to getting your full anomonly measurements for your twenty week scan I really wouldn't worry. It's incredibly unlikely they made a mistake and if they haven't spotted something it will 99 percent of the time be picked up at your scan