With both pregnancies, ive started showing visibly to other people around 20+ weeks. My first ultrasound was a dating ultrasound at about 8-9 weeks eith both and then my first trimester ultrasound was 12 1/2 weeks (: congrats amd goodluck!
I got my first talk with midwife at week 12, first ultrasound at week 18, started showing around week 17
I didn't show till about 25 weeks. I just looked like I was gaining weight, and I never got very big. My first ultrasound is always at 8 weeks, but I would guess if your 6-8 weeks now and your appointment is next week they'll likely do one then to see how far along you are and give you a due date.
I got my 1st ultrasound at 9 weeks, I'm 11 weeks now. I think they normally do ultrasounds starting at 6 weeks.
Like you said, everyone is different. I started showing a bit around 12 weeks, but then it started to look like I was just fat until about 20 weeks then it started to look like I was pregnant and not fat. My first ultrasound was at 6 weeks when I went in for my first appointment but it differs from every OB