For me, when it came to convincing DH that HE had to do the litter box the ENTIRE TIME I was pg (since I do it at all other times) - I said "Oh DH, you don't want me to take an unnecessarily risk do you?" - heh heh heh. Oh that was a nice 9 months of no litter box cleaning!!

In reality, I think the risk is small as long as you are sensible about it - wash hands etc. And of course the blood test will help