Food Adversions

Hi everyone, I am 8 weeks pregnant today and I am worried I'm not eating the correct amount of vitamins etc or healthy food due to the fact that the only thing that doesn't make me feel remotely sick at the moment is sandwiches! (Weird I know).
I've been taking my pre-natal vitamin everyday which is 'Pregnacare-throughout all of pregnancy) so I've been getting the correct amount of Folic Acid etc I just worry that in damaging my baby by not eating varied food types at the moment :(