I'm not a skinny Minnie either, n expecting to show a little sooner as this is my second, but was just saying to OH that my lower tummy feels swollen quite firm but it often does first day of AF too
Since having my daughter 8 years ago, when I gain weight I can always see that pregnant tummy shape lol! But last cpl days I'm looking at thinking its a bit more prominent :-/ I donno when things start moving up to make room for baby but I'm pretty sure it's not for a while yet
So..... It's all just confusing!