If You are five week's pregnant nothing would be seeing bub at this stage, I did not see bub until I was 10 week's and before that it was a suspected blighted ovum. Bloating is common in pregnancy, I know when I was earlier I was convinced I was either further or carrying twin's because I felt so bloated
I was bloated that early as well, I have to wear a bella band over my jeans.
I was also bloated really badly and while my stomach didn't look huge everything else did. Also remember. It might seem like a lot to you, but to others it might seem like nothing.