JoMarie, although this is my first, I had a perfectly flat tummy too. Had. I noticed I was "getting a bit of a podge" at about 7w, before I knew I was pg so tried to do more situps to get rid of it (although DH said he didn't notice a difference... he thought I was that fat normally?) and "popped" at 12w, although only ONE person has called it a bump who isn't close family, everyone else points out their podge is bigger than my baby belly! I think it's hard going from very flat to "a bit podgy" and you notice it earlier anyway.