what to wear?

Erica
I'm starting to seriously hate everything I own. I'm thirteen weeks and have gained about 4 lbs, which doesn't sound like much, but I'm short and it's all in my belly so it's pretty noticeable. I don't look pregnant at all, though, just like I've put on weight. 
And none of my clothes fit right! I can get by with most of my pants using a hair tie to hold the button, but tops are a disaster... last week I boxed up about half of them for being flat-out too small, and the ones that are left don't exactly look good. 
I know it's time for new clothes, but I can't find anything I don't hate. I don't want to get into maternity wear yet, but I just don't know where to shop for casual shirts that are sort of blousey and belly-hiding. Any ideas?