Hey Polly...The most likely reason for not giving out results is because of the reliability of thoses results before they have aquired statistics. Until they can be sure the tests/results are acurate they risk giving the mother a false positive or false negative...and that wouldn't be very nice...If they told you everything was ok, or vise versa, during their trial phase and it worked out that they got it wrong...wouldn't you sue...plenty would.
I still think it's great that you are a part of the trial...for the only way we can help future mothers is by people like you giving up their time for technological advancement, so well done!