dear sweetie,
is your results 1: 21X, or 1:21. Do bear in mind that OSCARS is just a probability test, it is not conclusive. For my #1, I was similar case as you. Test results also 1:2XX, gynae said a bit risky. I also cried and cried the whole weekend. But after reading more about it on the internet, I found out that many pple with results worse than mine also have babies that turned out fine.
HB & I were very undecided about taking amniocentesis due to the risk of miscarriage. At that time, our gynae advised us to go to the lab and scan the baby's development again at 16th weeks. If the baby's physical development looks very 'normal', we can re-consider about the amnio. If the baby's physical development looks high risk at 16th weeks, then we can go for the test. So we waited 1 month before going for scan again. The doctor at the amnio clinic was not very helpful. He told us baby looks 'OK' and he cannot guarantee anything, only amnio can give firm results. (PS. We think he just wants to make more $$ from the amnio test). In the end, after consulting our gynae again, we decided not to take the amnio since I was at higher risk of miscarriage due to presence of fibriod too. However, we did do another blood test called "quadruplet" test. This is similar to OSCARS, it is only a probability test, but it tests a different sets of hormornes than the OSCARS. The results of the quadruplet test turned out well, so we were more sure that we didn't want the risk of amnio and just beared with the suspense until baby was borned.
Sorry for the long post. Hope sharing my experienc can make you feel better.