I support you. Pay attention to hygienic matters is OK. My friends also live with pets when they were pregnant. I have 2 cats and they were my BB, I won't let them leave me in any circumstances. :evil:
I am pregnant for 16 weeks and I have a four-year old's dog as well. I don't think it is a problem. I read some articles saying that if you keep your place clean, pregnant mom and baby could be okay. If your dog is hairy, you can trim it short a bit. I totally support you. You know, my dog is one of my family member, not a pet!