I started noticing that clothes didn't fit so well at around 10 weeks, and by 12 weeks I was into maternity pants, because I couldn't stand anything tight around my middle. But I think to other people I just looked pudgy until around 16 weeks (or, in my mum's terminology "really potty" - charming!) but massive growth spurt around 16/17 weeks & I've well and truly popped. Even though I might have looked a bit plump, when I felt my tummy, even in the early stages, it's not the same as feeling excess weight, for me it was firmer & rounder.