I popped immediately with my second too. My dad knew I was pregnant before we told them, and we told them when I was like 5 weeks. My dcp for my daughter actually asked me if I was pregnant one day when I went to pick my daughter up, and I was only maybe 8 weeks, that was how much I was showing. We were planning on telling her soon, but I wanted to figure out when I was going to leave work, etc. before telling her.
Funny how much your body "remembers" pregnancy.