I didn't show with my first two until around 25 weeks (and they are just under a year apart) I'm now 15 weeks and still not showing although I can't wear any of my previous jeans so I have to wear the skirts I own.
Im 11wks and look like Im 3 months. Its been like that for me since 7 or 8 weeks and this is my fourth. :)
You will show earlier but it could also be bloat! Chances are its bloat :)
I started wearing maternity pants by 8 weeks and it's my second.
Yes. Being that this is ur second pregnancy ur cervix is more relaxed so it makes u show a little early :)