I cannot stress enough that I’m not being rude or trying to start something I’m just trying to understand.

I’ve noticed a lot of ladies in early pregnancy “showing” their bump before even 12 weeks. Wasn’t until my SIL became pregnant and she has always had a bump look with her stomach as she is a little chubby. She is 10weeks and she has told and showed everyone her “bump” and I’m just gobsmacked because she looks the same she always was? I’m going on 16weekd and my bump is just a starting to show even the ultrasound lady says at <13weeks they are so tiny so how do ladies think their “bump” is the baby and not just accepting it’s a little fat? Again not trying to be rude or step on toes I’m just curious and thought this was the safest place to ask.