Immunized

I have to get an MMR vaccine today as I prepare for graduate school. Oww! Since I don't have any doctor's records of getting these shots as a child (which I did get), I have to get them again. One today and one in about a month. I'm not worried about the actual shot (shots don't bother me) but I am a little worried about possible side effects. Just a little. I'm more worried about not being able to start school on time if I'm not immunized, though. I hope they don't check into it too closely.