I have never been in this situation and can barely comment, but if it did happen to me, I'd probably want the blood test from what I'm hearing from these ladies. I guess it depends...if you're strongly against, and you're going to abort if the baby's got DS, then you'd probably want to know now while you still have the option to do so (abort). However, if it doesn't matter either way and you'll keep the child regardless, it's not so necessary.
Again, I'm not experienced in this, but that would be my reasoning. Maybe it'll help you.
