Insufficient dna from harmony test

[Agapanthus13]

Has anyone else had this? I’ve booked to go back for a blood redraw next week and am desperately hoping they can get a good result the second time round but I’ve stupidly googled in the meantime and am now worrying it’s a sign of fetal abnormalities. My BMI is low, single pregnancy and I was 12+4 when I had the test, all looked well on the scan. I am on clexane blood thinners and have an IVF pregnancy so wondered if those could effect it?
thanks in advance

I'm not a medic but it would seem likely that the blood thinners have diluted your blood so they couldn't extract the DNA. I was told when I had the NIPT that sometimes they can't extract enough and not to worry!

Yes I had this with a twin pregnancy which is quite common. I believe it also happens more often if you are overweight.