AJP, I kid you not, I was showing by 3 weeks with DS2. DH knew I was pg just from my tummy, before I was even 4 weeks!! And it wasn't just him - someone else congratulated me on being pg before I even knew!! I hadn't done a test yet or anything!!

Don't worry too much though, I still didn't get bigger over all than with DS1 (although I might have if he hadn't come 4 weeks early!).