So sorry to hear what you are going through, must be horrendous waiting. The community midwife who looked after me when I was expecting my son- her sister in law had a Downs risk of 1 in 4 and everything turned out ok. I know it must be very hard to keep positive, but even at 1 in 5, the odds are still good on the baby being fine, plus you have other good signs. Sometimes, all these tests, scans etc worry people needlessly. It's disgusting the lab haven't informed you if there is a problem with the sample - I would chase them up and maybe speak to someone else...