What if I don't like my dress! Eeeek!

Just out of curiosity, has anyone else found the following. On searching for my dress I had no clue at all what I wanted. Tried loads of dresses on (with my lovely patient mother I might add) on and came to the conclusion that I wanted a sweetheart neckline. Then tried a dress on for fun because it had a 'weird neckline' I fell in love with it, nothing like I thought I wanted! We ordered it there and then, and refused to try any other dresses on because I loved it! But now I'm worried that I'll not like the dress as much when I get my actual dress! Has anyone else felt this?:-)