Does drinking diet pop make you bloated?

So, in the past couple of weeks I have been trying my hardest to eat healthy. I've kept it around 1200-1400 calories a day, and I exercise (Running, Cheerleading, Gymnastics). But I feel like I got bigger. I noticed the only difference is that I have been drinking a ton of diet pop. I know its pretty much nothing--no calories, no sugar, but can it make you bloated? I'm not that big, I'm 5 feet 102 pounds, so it doesn't look so great when I get bloated :P Will cutting out the pop help me look trim?