Wow, you sort of sound like my last pregnancy. But I didn't know I was pregnant yet. Here's what happened to me:
We'd been trying for a few months, and each month I'd do the two-week wait before I tested. But the night before I could test, I'd always get my period.
Then one month, my period came early by about a week. I thought it was strange, but figured that at least I'd shifted my cycle a week earlier, so next time I'd be a whole week closer to getting pregnant. But it was lighter than usual and only lasted 4-5 days (usually mine are longer, lucky me). I started wondering if it was implantation bleeding but didn't want to get my hopes up. But the night before I could take a pregnancy test, my breast started hurting really bad and I got my hopes up! The next morning I got a positive test.
Not too long after that, I got so bloated that it felt like I was much farther along. When I lay on my stomach, it felt like I was about 4 months along. I'd never been bloated before. It was awful. But after about a week it went away.
I don't know your timing, if you've already gotten a positive test or what. But if my story sounds like yours, you're probably fine. If anything is out of order (like positive test, then bleeding) you should see a doctor.