Another lady on this thread recently had this issue TWICE! Search back a little and I'm sure you'll find it, it was "not enough fetal DNA" in her case, though all her ultrasounds are just fine so clearly it's not a problem with the baby not being in there! Sometimes, upon reading her thread, it seems to be a problem with the individual lab. If you did Harmony, try Naterna or Materniti or any of the others the next round for a better result.
Re: Harmony test results inconclusive....?