Anybody do the MaterniT21 test and have to do it a second time due to not having enough baby DNA in their blood? Was the second time the charm? I went in two weeks ago for this test at 13+2 and the results came back last Monday that they were unable to do the test because it required a minimum of 4% baby DNA from my blood and they were only able to gather 3%. The genetic counselor asked me to come back today (two weeks later) to draw my blood again. Hoping I have enough this time. I am on blood thinners so I do understand it may not work at all. But just wondering if anyone else did it twice and was able to get results?