Vaccinations and babies!!!

I'm curantly pregnant and doing a lot of research on vaccinations. Being 37 year old and having my first child,  I of course have a lot of questions.  Like every mother to be I want a healthy happy kid. But I'm terrified of over vaccinating my baby, and having potential problems from vaccines. I want to hear your opinion, vaccine or Not to vaccine?!?  Especially from moms with kids with Autism? Do you believe that vaccine contributed to your child's autism? Were they happy, healthy kids to start with? Did they change after the shots?