Can I be pregnant or not?

Ladies, I'm a bit embarrassed to ask this question, but I'm really wondering about it. I thought I'd just ask. I was wondering if I could be pregnant. I've gotten a bit of a belly, and I'm naturally slim, so people notice pretty quickly that I'm bigger than before. My stomach feels very bloated, and almost all my colleagues and people in my neighborhood ask if I'm pregnant. But I still get my period every month, so I doubt it's pregnancy. I've also only gotten bigger in the exact area where you'd normally see a baby bump – it's tight and swollen-looking, not saggy fat. And sometimes I feel little pops. I don't know exactly...