when i have oscar, my result is 1/26., which is very very very high risk, in the beginning both my husband and i decided not to 去抽羊水,because we decide to accept this no matter what happens, but til 18 wks, the doctor suggested us to 抽羊水 at least we can have a more clear picture. then on the same day, I 抽羊水 and few days later the result back and the doctor told me that my bb does not have oscar, this based on the result. I do understand this is a very difficult decision to make. Will support you and pray for you.