Stomach tattoo and pregnancy?

Hi, i was wanting to get a tattoo on my stomach but have heard that it stretches and never goes back to normal if you were ever to get pregnant....is this true?? and also, with pain wise, is it very painful in comparison with other tattoos? this will be my first and im very scared!! im getting something like one of these http://img.photobucket.com/albums/v52/juicypink/tattoo-6.jpg http://i15.tinypic.com/8ert1kn.jpg thanks