We had the odds come back 1:89, which, like ardenbird pointed out, really isn't that bad! But it is labelled high risk and everyone leaps into action asking what you want to do, etc. That almost made me more worried than the risk itself!
Like you, we decided against an invasive test based soley on that result. We didn't want to risk a miscarriage, however small the risk was. So after much heartache, we went for an early anomaly scan at the Fetal Medicine Centre in London. We saw Prof Nicolaides who has a brilliant reputation and is at he forefront of all things fetal. At the scan, there are far more things looked at than just one measurement of fluid.
If there had been markers present, we would probably have opted for the amnio, but done by him. As it was, there was nothing unusual seen, and we were reassured. He did say that we could have an amnio at 32 wks if we wanted certainty and time to adjust to the idea. Not sure that we will. We feel much happier now.
And I don't think we'll be having the screening done again, as we wouldn't want to terminate, but the worry was incredible.
Good luck to you and to bansku