Woah, lots of

here...
I've put a LOT of thought into the problems of vet school and pregnancy/babies. For the last few months especially, I have been trying to decide how to plan having a baby, which is something my husband and I both wish to do--we don't want a big family, but we would like to raise one or two children, and I would prefer to not wait until I am 30 to start a family. The trick is how to time vet school around this. I've been reading as much as I can find regarding medical/veterinary school and family, mostly in the form of anecdotal evidence on message boards like this one.
If I were in vetschoolz's position, I would try to defer for a year, but this is an incredibly individual decision. It depends so much on how much local support you have; personally, I'm sure that I would find it very hard to deal with the end of pregnancy, labor, delivery, and a new baby... all around finals time. As far as vaccines and so on, if you do decide to go for it and go to vet school this year, I'd certainly contact your school and try to plan ahead as best you can. You won't be their first pregnant student trying to solve these problems.
On the topic of fair treatment... whether you believe pregnancy is a choice like any other or not, it is something people do. With so many women going into veterinary medicine, and many of us going in our mid-late 20s and beyond, there are going to be students who are pregnant or with small children. Even as there are women who talk incessantly about pregnancy and ham up their problems, there will be women who deal with the whole process with aplomb, working hard throughout their pregnancy with minimal complaining. A little understanding goes a long way. Still, the issues of balancing pregnancy, which can be unpredictable, with something as all-consuming as vet school, are exactly why I will probably defer even applying to vet school for a year or two.
Best of luck with your preparations, vetschoolz! Congratulations.