15 weeks and feeling chubby not preggo 😔

Jamie • 21 years old 🎊 First baby girl was born on June 27 thanks to glow.👶🏼🌻
I was having a talk to
My sister today when she showed me pics of her when she was 15 weeks! My sister stomach was more flat than mine before pregnancy, (she was weighing before pregnancy 127 and I was weighing 135) 
when she was 15 weeks she had a very noticeable bump now I'm 15 weeks and I just look like I gained weight I look really chubby! I even have seen other people and you could see their cute little bump. 
When did you started looking pregnant ? 
Or did you looked chubby before your preggo stomach was noticeable?!? 🙄