CVS Screening? 2nd tri abortion?

Our doctor won't make any sort of recommendation either way on screening options. She said we can do an invasive (CVS) at 10w that carries a 1 in 160 chance of miscarriage if we really want to know if our child could have a chromosome defect or do a non invasive screening at 12 weeks that just tells us what the chance of abnormality is. We will not carry the child if it is defective, but I also don't want to put it at unnecessary risk. So, my questions are: 1) what have your docs said about this CVS screening (riskier but would have to be done first to reduce risk to mother in case abortion is needed) & 2) just what are the medical risks to myself by waiting 2 additional weeks for an abortion if needed?