I had my first one a couple of weeks ago. I had mixed feelings about it but decided to go ahead as I'm likely to have a few other things to deal with post-birth. If you don't feel comfortable and your antibody tests are neg, then I'd say don't do it and deal with the situation when Liebling arrives. You're obviously informed enough to be able to make your own decisions about this sort of stuff!!

Is your DH 'normally' like this (have seen some of your other posts) or might this be him completely freaking out about the whole event? Mine behaved like this about me wanting to have children (he was scared of it all) and for the first 9-12 months of TTC but then settled down again. Maybe he needs some support of his own as well as learning how to better support you.