Vaccines during pregnancy and for baby after birth

I am trying to find out more information regarding the different types of vaccines that Dr.'s want me to get while pregnant and for my baby after. I have heard that not all the vaccinations are nessasary and some can do more harm than good. Does anyone know of a website or book available that is pretty informative? Today my Dr. told me since I'm in my third trimester, I should get the Tdap shot.