You're probably bloated which is normal in early pregnancy. I was so bloated I looked 4 months at 8 weeks.
When I was just 10 wks with my 3rd I was showing. Couldn't even fit in my regular pants.
Most 3rd time Moms show fast because your body remembers what to do it what other Moms have told me
Yes im on baby #5 and im almost 14 weeks but look like 6 months lol depends what I eat too because some times I feel I look thin lol your body definitely remembers and gets right back into position I think lol ;)