Poor you, If you are having a pregnancy any thing like mine I bet your feeling really tearful and confused...By the way my first was born 22 July. It is a really nice time of the year to have a newborn. My second was a December baby and the winter days and nights with no sleep can be depressing.
Any way back to the point...Most people who dont have dogs, have not got them for a reason, i.e they are not doggy people. So they are not in any position to comment to you about your lifestyle , which they know nothing about. They probably cannot comprehend sharing those preciouse first days of their fragile sterile newborn with a dog.
Some people may have dogs and disagree with dogs and babies, i.e They have a dog that they know is unsuitable around babies and children so cannot comprehend what it is like to have a dog that is.
Basicaly only you know your dog, no one else. Only you can choose your lifestyle,no one else.
You are obviously a responsible person and I think you and your partner should have a good chat, Unload some of your worries so when you get hassled in future, by ignorant, do gooder busy bodies, it wont muddle your thoughts . ( As thats how I felt when I was pregnant)
Carry on doing your research and preparing your dog for the most wonderful experience of your lives...GOOD LUCK!