No, don't. And yes I think it's great for kids to grow up with dogs, I have a toddler, baby and 2 large dogs myself.
It works fine - but dogs were 3 years old and fully trained before the first kid came along. This meant weekly dog school, plus training at home for more than a year, you won't have the dog trained in just a few months. Where would you find time and energy for this when pregnant or with a newborn?
And you really don't want to have a young bouncy untrained lab or boxer around babies - one friend cannot visit us any more, as she always wants to bring her lab, and this will knock adults over when running around, not to mention toddlers. Or can you imagine walking the dog, with a baby in pram, dog pulling full strength?
As for the 'something to get out for' - yes, in theory. In real life, if you have been up about a dozen times that night and the baby has finally, finally fallen asleep, and that very minute the dog starts barking and whining and demands a walk - not so much fun as it sounds.
Wait a little, will be a lot more enjoyable experience.