First of all, congratulations!
Second, I agree with road. I got married during graduate school and, on the whole, I think that the two experiences went together very well. It will be important to purposefully make a balance between your school and home life, but it should give you a much better perspective on what you're doing in the classroom and why. What worked best for me was to treat school like my 8-5 job (or 6-6, as the case may be sometimes). The time I invested in my relationship with my wife paid off huge in terms of support and understanding (it can be like having a cheerleader, you always know that at least one person thinks you're cool!).
Best of luck to you two!